Lesser Evil Lesser Evil is a Pocket DS9 novel – part of the and the fourth novel in the " " series – written by Robert Simpson . Published by Pocket Books , it was first released in . Summary . Ruriko Tenmei . After catching a Starfleet distress signal , the crew of the , still in the Gamma Quadrant , lands on a planet and finds an old starship – one that has been completely assimilated by the Borg . Elias Vaughn finds out what has become of his wife , whom he thought was dead : Ruriko Tenmei , mother to Prynn Tenmei , has been assimilated and is now a Borg drone . Julian Bashir tries everything to revert the Borg ' s alterations , and Prynn tries to assist as best as she can . After a long talk Vaughn has with Ezri Dax , in which she makes clear to him that he has to report the events they encountered , namely the presence of a Borg ship in the Gamma Quadrant , Vaughn finally accepts this and tells Dax about the situation in which he sent his wife to her death seven years ago – a decision that diverted him from his daughter . While bringing another Borg drone aboard , this one already dead , its nanoprobe s all of a sudden come to life ; it becomes clear that , even if the drone is long dead , the technology still works . Vaughn , fearing for his daughter ' s life , runs to sickbay , only to see that the drone formerly known as Ruriko is too close to Prynn – and after Prynn backs away , seems to start chasing her . Protecting his daughter , he kills the drone , leaving Prynn devastated . Ezri later tries to explain to her what her father did , deliberately holding back some of Bashir ' s findings , namely that there could have been a chance to save Ruriko ; Prynn believes that the Borg ' s alterations had destroyed her brain too much to reverse the process . Still , she is not sure whether she could ever forgive his father for taking her mother again . The Changeling and the Borg . On the same planet they found the Borg vessel , the crew also finds a Jem ' Hadar vessel ; the two ships obviously having fought against each other , leaving both damaged on the planet . Nog and Shar detect a Changeling aboard the Jem ' Hadar ship , obviously still alive . They manage to contact her ( it has the form of a girl ) , and explain about the changes that happened during the last two years , in which the Changeling was alone on the planet : the end of the Dominion War , the new situation with Odo and the presence of Taran ' atar on DS9 . The Changeling agrees to come aboard the " Defiant " . On the ship , the second Borg drone tries to assimilate the Changeling – but since Changelings do not have cellular structures , it fails . The chase to Trill . After the murder of Shakaar Edon , the USS " Gryphon " is sent to Trill , and Kira Nerys is ordered aboard . On DS9 , the medical staff finally discovers that Shakaar was under the control of a parasitic being and was obviously killed because of that . It becomes clear that someone aboard the " Gryphon " must be under the control of one of these parasites as well . After talking to First Officer Montenegro and Admiral Leonard James Akaar , who relays the recent findings , Kira is convinced that Captain Elaine Mello is the person in question & ndash only to find out that in reality it was Montenegro , who then tries to bring the ship under his control , killing Mello in the process . Mello , before dying , transfers the command of the ship to Kira ; the Bajoran colonel finally manages to kill both Montenegro and the parasite , and thus prevents the starship from approaching Trill and assaulting the planet . Kira is contacted by a Trill admiral who promises to tell her everything about these events – claiming that the parasites ' target are the Trill symbiont s . Joseph Sisko . Joseph Sisko is still in very bad shape , when Kasidy Yates finally has the idea of contacting Miles O ' Brien and his family . They arrive at Sisko ' s house , and the effect Miles , his wife Keiko O ' Brien and especially his kids have on Joseph is marked : the old man is rejuvenated , and begins to accept the events that left him so depressed . He then decides to travel to Bajor , to see Kasidy and to be present when his grandchild is born . Return of the " Defiant " . Finally , after their long mission , the " Defiant " heads for DS9 . When they arrive at the wormhole , they find that their communications relay is destroyed , and that the Idran system all of a sudden has shifted position – now located at the mouth of the wormhole . While investigating , the crew is contacted by a Jem ' Hadar ship . A Weyoun clone requests the Changeling they have aboard , and in return beams three passengers they have picked up to the " Defiant " : Kai Opaka , an alien named Wex , and Jake Sisko . Jake says to his stunned friends that he has a long story to tell . . . References . Alpha Quadrant ; Andorian ; Bajor ; Bajoran ; Bajoran wormhole ; Capella IV ; Capellan ; Cardassian ; Cardassian Union ; ; Deep Space 9 ; ; Dominion ; Emissary of the Prophets ; Ferengi ; Ferengi Alliance ; Ferenginar ; Founder s ; Gamma Quadrant ; Grand Nagus ; Great Material Continuum ; Jefferies tube ; Jem ' Hadar ; kai ; Klingon ; Ktarian ; Morn ; Orion Syndicate ; Portland ; Prophet s ; Rom ; Romulan ; San Francisco ; Shakaar Edon ; ; ; ; ; Starfleet ; Starfleet Academy ; Tellarite ; Trill ; Trill ( planet ) ; United Federation of Planets ; ; warp core ; Tzenkethi