Keep your friends close. And your enemies closer. Cara shouldn't have survived the attack.

But at the last moment, a stranger snatched her to safety. In the hours that followed, she told her Good Samaritan secrets she'd never told a soul. Not even her husband.

Especially not her husband. In the aftermath, Cara is home, healed and safe. Which is when the anonymous threats begin.

Someone knows things about her that they shouldn't. Cara's Good Samaritan offers to help - to save her all over again. That night, Cara made a friend for life.

But what if she isn't a friend at all?