Ingo tetralogy
The Ingo tetralogy is a series of four children's novels, set in Cornwall, by British author Helen Dunmore. The four books are, in chronological order, "Ingo", "The Tide Knot", "The Deep" and "The Crossing of Ingo". The first book was nominated for the 2008 Booktrust Teenage Prize. There are 4 books in this series, written by Helen Dunmore. Ingo Sapphire is faced with her father's (Matthew Trewhella who is coincidently related to the Matthew Trewhella associated with the Zennor mermaid) sudden disappearance when he left Sapphire's mother after an argument. All they found was his  boat, the Peggy Gordan, capsized with nothing in it. Many people had different theories about how her father disappeared, how he had run away with another woman, faked his own death or had died. Nevertheless, they had the funeral anyway, where Sapphire and Conor make a pact to never stop looking for their father. A year later Sapphire follows Conor down to the cove after he has been missing for nearly a day. There she meets Faro, one of the mer, he is prideful and patriotic to his people and invites her to Ingo, an underwater world where the mysterious  mer people dwell. At first she has to keep a hold of his hand to ‘breathe’ but after a while she can do it by herself. Time runs differently in this place and when she finally resurfaces she realizes she has been gone for two days when she sees Conor waiting up for her on the cliff having slept there for the night. Her mother was away so she didn't notice that Sapphire was missing but after that disappearance Conor is against everything to do with Ingo. Time goes by and Sapphire is affected by Ingo more and more ; Craving salt, hearing her name called by the sea and finding it hard to breathe once she resurfaces from the water. The only thing that can stop her from her yearning from Ingo is Granny Carne (a wizened old woman whom the village folk go to with their troubles). And it's from Granny Carne that both Sapphire and Conor learn of their Mer inheritance. By this time Sapphire's mother has acquired a boyfriend; Roger. Roger plans on taking a dive at the Bawns which is the sacred resting place of the dead in Ingo; Limina . Ingo will do  everything to protect it. Sapphire and Conor go on a rescue mission to save Roger and Gray (Rogers diving partner) from the bull seals who protect Limina. Conor hears Limina's song, the song that you're supposed to hear when you die. Conor repeats it to the bull seals and they stop attacking Roger and Gray. Then Conor and Sapphire haul Roger and Gray into the boat with the help of Faro and Elvira, Conor's mer friend, and wait for them to recover. The Tide Knot Sapphire now lives in St Pirans with her Mother, Conor and Roger . Conor adapts easily to the new City life whilst Sapphire is becoming more withdrawn and turning to Ingo. One evening she walks Sadie down to the beach and leaves him whilst going into Ingo alone to meet Faro. When she comes back she finds Sadie in a terrible state and skips school the next day to take him to Granny Carne to see if Granny Carne can do anything for him. She stays overnight. Whilst she's staying at Granny Carne's she hears her name whispered in the language of Ingo. She follows it and finds her father, now  one of the mer, in a river who had traveled all the way just to warn her that the tide knot is loose. Conor and Sapphire travel with Faro to meet his mentor Saldowr. There Sapphire is whisked away from Faro and Conor by a rogue current into the deep with no knowledge with which way is up and which way is down. She is then brought back to lighter waters by a whale. There she meets up with Conor and Saldowr but she can't meet up with Faro because he is severely injured and rests in Saldowrs cave  a place where only the mer can entre. Conor inquires after his father and they learn that his Father is married and has a child. But just before they leave they learn of the Tide Knot which has become loose and shortly after they arrive home it loosens completely unleashing a terrible tidal wave that floods the town. She finds her Mother and they, with Rainbow (Sapphires somewhat weird friend) hide away in the attic, when they are all asleep Sapphire jumps out the window and finds Faro with Conor. The currents under the flooded town are really strong and  Sapphire gets slammed against a wall so they call Elvira, a healer. Once Sapphire is healed they swim to Saldowr who looks old and weak. The tide knot and broken out of its cage and shattered the pieces which Sapphire, Conor, Elvira and Faro all find and put together sealing the Tide Knot back into its place. Sapphire and Conor go home to find it in tatters so they get to move back to their village and move back into their old house. The Deep After the devastation of the Tide Knot the Kraken awakens and it is said that  only half mer and half humans can overcome the Kraken; a terrible monster who can only be put back to sleep if one boy and one girl be sacrificed for him. Faro invites Sapphire to a mer assembly with Conor. Once there Conor and Sapphire make a deal that they will overcome the kraken if their father can have the choice to leave Ingo because they believe their father is there against his will. Evrys, the mer's spokesperson, is irritated with their proposal but agrees because Conor and Sapphire are the only ones who can save the mer. Faro  (because he's not all mer), Sapphire and Conor descend into the deep with the help of the whale. They face the Kraken who's a shape shifter and have a battle of wits. Sapphire finally puts him back to sleep using the rowan berries which Granny Carne had given her before she went down to face the kraken. They all go back to tell the mer the good news. Faro asks Sapphire to make the crossing of Ingo, a trip around the whole globe which the mer make when they come of age, with him. She agrees and asks  if Conor can join them which Faro agrees with. Evrys is furious because it was only a mer tradition. Faro says that Elvira will come too and Sapphire is a little uneasy with Conor and Elvira together. The Crossing of Ingo Sapphire and Conor accept the call to the crossing of Ingo. They meet up with Faro who tells them that Evrys is adamant that they don't accept the call and that he has many followers among the mer who will cause trouble and stop them from making the crossing whether they’re killed or not . The future of  air and Ingo depend on Sapphire's and Conor's success. Sapphire's mother and Roger are in Australia for 3 months leaving them home alone with Rainbow and her brother checking up on them every so often. With their parents in Australia Conor and Sapphire have just enough time to make the crossing. They hear the call a couple of weeks after their parents leave and know what it is and know they must answer. One day, when they come back home after an outing they find seagulls nesting on their roof they believe the seagulls are sent by  Evrys. Later, the seagulls attack Sadie, sapphire's dog. Sapphire takes the dog to Granny Carne who heals him and promises to look after him while they’re in Ingo. They join up with Faro after a little trouble getting past the cove which Evrys and his followers had turned into a Porth Cas keeping them out. The three then go to the assembly chambers and hide from the Evrys followers till they are either accepted or rejected to make the crossing by the mer. They are all accepted, but when Sapphire and Conor went up their father kept silent  in rejection. They meet again with Faro and Elvira outside deciding on the best plan of action so they would not be stopped by evrys followers. They’re attacked by Évrys's sharks and saved by dolphins. Conor, Elvira, Sapphire and Faro decide to head North instead of South (the mers traditional route). Conor and Sapphire meet their father who explains his rejection as he wanted them to be safe. He tries to come with them but when denied he wishes them luck. So they head South taking the currents until they’re under the ice of the north where  they separate; Conor with Elvira and Sapphire with Faro. Sapphire meets her Atka, a strange mer like creature who dwells on the ice. Her Atka wants to touch her but she doesn't let her because she has a bad feeling about what her Atka will do to her. Sapphire and Faro finally meet up with Conor and Elvira they head South again as they travel around the world. Elvira grows desperate to go back to the North and Sapphire thinks it's something to do with the Atka. Sapphire convinces Elvira to stay with them until the end of  the journey. Elvira agrees. They meet a strange group of mer who have short hair and keep to kelp forests. They’ve never seen humans with mer in them before nor have they seen Faro's type of mer before. After the brief strange encounter they keep on going. Sapphire calls dolphins to take them part of the way of the journey. They stop briefly where Sapphire meets her friend the Whale's daughter who has had a baby. They take the flight of the dolphins all the way back to the lost islands (islands buried underwater with huge settlements  still standing). They’re attacked by Evrys and his followers. Sapphire's father comes and joins them and is killed in battle. Sapphire and Conor make the complete circle and see their father returned to Limina. They all head home. Characters. Sapphire Trewhella Known as 'Sapphy'. The narrator of the books, a young girl with a temper and a connection to the sea. She has long hair, which is similar to the colour of Faro's. She has a Labrador puppy named Sadie and a lovely singing voice . Granny Carne has told her that she is in more danger than  Conor of being pulled into Ingo. Although Faro has hinted at it, she refuses to believe that she may become Mer. She always wears the deublek that Faro made her. Conor Trewhella Sapphire's older brother, who has a levelheaded and calm approach to problems to balance Sapphy's hot-tempered one. Since he and Elvira may or may not be in love, Sapphire worries that he may abandon the human world completely and become Mer, as their father did. Although he does not sing often, It is revealed that he also has a strong singing voice. At the beginning  of the series he appears to have difficulty going between Ingo and the Earth, and that he has a stronger connection to Earth. At the end of the Deep, Sapphire is terrified to learn that he has started to swim as if he has a tail. It is also revealed that he can talk to land animals, while Sapphire cannot. Faro A Mer boy who is the first to show Sapphy the world of Ingo. He is described as having dark hair, brown eyes, perfectly white teeth, and suntanned skin. He is offended when Sapphire calls him a mermaid  ("do you go to school with a lot of nice maids?"). Sapphire compares his tail to that of a seal, however on the covers of the novels it looks as if he has a seal's tail with a whale's fins. He is intensely proud of being Mer, however he later learns that he also has human blood in him. He always hints (or hopes) that Sapphire may become Mer, and while he calls her his sister, it is unknown whether he feels a romantic or brotherly love towards her. He is also Saldowr's apprentice and protects him  with his heart and soul. Always wears a matching deublek to Sapphires. He likes to tease, and calls Sapphire "Little Sister". Elvira A mer girl that Conor has a crush on, and Faro's sister. She is said to have curly black hair, and is beautiful. Father of Conor and Sapphire. Disappeared at sea when Sapphy was ten and Conor was twelve. Jennie Trewhella Sapphire and Conor's mother. Has a fear of the sea and worries about her children getting so close to it. Granny Carne A wise old woman full of Earth magic who makes sure Sapphire and  Conor don't get so engrossed in Ingo they forget the Air. Saldowr The Ingo equivalent to Granny Carne. Believes Ingo and Air need to live peacefully side by side. Roger Jennie's new boyfriend. A diver, originally from Australia. Disliked by Sapphire at first, but she grows to realise and accept that he is a good person and good for her mother. Sadie Sapphire's golden retriever which she receives in the second book. In the fourth book Sadie is Sapphire's only link to 'air'. Rainbow Sapphires strange friend who she meets in the second book. Evrys A  cruel, arrogant leader who tries to take control of the mer.