Book excerpt: Tessa is a Variant, able to absorb the DNA of anyone she touches and mimic their appearance. Shunned by her family, she's spent the last two years training with the Forces with Extraordinary Abilities, a secret branch of the FBI. When a serial killer rocks a small town in Oregon, Tessa is given a mission: she must impersonate Madison, a local teen, to find the killer before he strikes again. Tessa hates everything about being an impostor—he stress, the danger, the deceit—but loves playing the role of a normal girl. Disguised as Madison, she finds friends, romance, and the kind of loving family she'd do anything to keep. Amid action, suspense, and a ticking clock, this superhuman arrives at a very human conclusion: even a girl who can look like anyone struggles the most with being herself.