Title: The Mystery of the Missing Necklace
Content:   The Mystery of the Missing Necklace — is a book in the series of Five Find-Outers and Dog by Enid Blyton, published in 1947 by Methuen and illustrated by Joseph Abbey.
Title: The Indigo Necklace
Content:   The Indigo Necklace (1945), also published as The Indigo Necklace Murders, is a mystery novel by Frances Crane.
Title: The Mystery of the Missing Man
Content:  The Mystery of the Missing Man, published 1956, is the thirteenth novel in the Five Find-Outers written by Enid Blyton and originally illustrated by Lilian Buchanan.
Title: The Norwood Necklace
Content:  The famous Norwood necklace has been stolen and the female detective, Violet Grey, is wired the details of the case after officers in another city failed to make an arrest in the case. As the authorities are en route to apprehend the well-dressed woman suspect, the suspect receives a warning by telegraph allowing her to conceal the necklace. When the police apprehend the suspect, nothing is found and the captain has to apologize profusely for the error. Only Violet Grey did not believe an error had been made. She makes a bet to her superior office that her suspicions were right. With the clues of the little girl and her doll she tracks the suspect to a hotel, and disguised as a maid finds the necklace. The woman is arrested and Grey uses the money from her winnings to buy 
Title: The Mystery of the Vanishing Treasure
Content:  The Mystery of the Vanishing Treasure is an American juvenile detective novel written by Robert Arthur, Jr. It is the fifth book in the "Three Investigators" series.
Title: Unravelled Knots
Content: The Mystery of the Khaki Tunic ; The Mystery of the Ingres Masterpiece ; The Mystery of the Pearl Necklace ; The Mystery of the Russian Prince ; The Mysterious Tragedy in Bishop'S Road ; The Mystery of the Dog's Tooth Cliff ; The Tytherton Case ; The Mystery of Brudenell Court ; The Mystery of the White Carnation ; The Mystery of the Montmartre Hat ; The Miser of Maida Vale ; The Fulton Gardens Mystery ; A Moorland Tragedy 
Title: The Clue of the Broken Locket
Content:  The Clue of the Broken Locket is the eleventh volume in the Nancy Drew Mystery Stories series. It was first published in 1934 and was written by Mildred Benson under the pseudonym Carolyn Keene. It was later revised by Harriet Stratemeyer in 1965, and the story was mostly changed with a few elements of the original.
Title: Metaphysical detective story
Content:  Another significant theme is the focus on the missing person, which can be the centre of the mystery and the aim of the detection. A wide arrange of detective fictions involve such a missing person as the backbone of the whole story. Specifically, the person might disappear all of a sudden at odd time and odd locations. The missing person cases may be extremely complex and entangled with multiple clues. In the face of such cases, the detective may detect the disappeared person by searching public records, checking internet communities, and conducting surveillance at locations. Some of the latest fictions of this theme may involve The Missing Girl by Jenny Quintana, Everything About You by Heather Child, Perfect Match by D. B. Thorne.
Title: Partners in Crime (short story collection)
Content:  them together with an American couple, Mr and Mrs Hamilton Betts, who wanted to meet a titled lady. During a bridge game after dinner, the clasp of Mrs Betts' pearl pendant necklace broke. She laid it down on a small table and forgot to take it upstairs. The next morning, the necklace was still there but the pearl itself had gone. Aside from the Kingston Bruces, the Betts, Lady Laura, and St Vincent, the only other guest was Mr Rennie, paying court to Miss Kingston Bruce. Her father does not like him as he is a socialist. No one has been allowed to leave the house since the pearl was discovered to be missing, except for the daughter when she 
Title: The Listerdale Mystery
Content:  about her and 'Jimmy' having successfully stolen the necklace from a rich lady called Agnes Larella. She drives him to a London townhouse where the butler arranges evening dress for him and the lady drives them onto Ritson's – the nightclub of the rich and famous. He drinks cocktails and dances with the lady. He discovers that she is Lady Noreen Elliot, a famous society debutante. The theft of the necklace was in fact an elaboration of a treasure hunt, the rule being that the 'stolen' item must be worn in public for one hour to claim the prize. As Edward and Lady Noreen leave the 

Question: Who is the author of The Mystery of the Missing Necklace?
Answer: Enid Blyton.
Enid Mary Blyton.
Mary Pollock.