Missing Sister : A Novel.

In 'Missing Sister', rookie cop Penny Albright arrives at a murder scene to find that the victim is the man responsible for her sister's death. A woman at the scene, holding a bloody knife, tells her that the story isn't over, and it is about sisters. And with that, the killer disappears. Now, Penny will stop at nothing to pursue this woman and the deeper she dives into the mystery, the less clear it becomes who is hunting whom.