Star Trek: Deep Space Nine : Fearful Symmetry
Olivia Woods2008

A surprising tale of doubles, secret pasts, and alternate realities. In our universe, a Cardassian sleeper agent – Iliana Ghemor – was once surgically altered to resemble and replace Bajoran resistance fighter Kira Nerys. That plan never reached fruition, and the fate of the agent remained unknown... until now.

Robbed of the past sixteen years, and on the brink of madness, Iliana is back with a vengeance. She has already made one attempt on the real Kira's life, and the heroes of Deep Space Nine must now stop the false Kira without derailing the delicate flow of history that must unfold if two universes, and countless others are to survive.