When a small town in Oregon is attacked by a serial killer, Tessa is the only one who can stop him. It is able to absorb the DNA of anyone it touches and reproduce its appearance. As part of a secret FBI unit, she is sent on a mission to impersonate Madison, a local teenager and the last victim of a violent assailant, in order to find the killer before he strikes again. As if pretending to be someone else wasn't difficult enough, Alec, a guy she's been in love with for years, joins her on a mission. The attraction between them only complicates everything .. Tessa knows she can't let her feelings for Alec get in the way of her case, especially since it's all hopeless. Alec is not only her self-defense coach, but he also has a girlfriend. Will Tessa find the killer before he commits murder again? Or will she lose herself in the life she's always craved?