An FBI agent with a dark secret. A killer on a mission. A murderous past that unearths an unexpected connection. BAU Special Agent Hannah London’s troubled past reminds her that life is fragile. And hers has an expiration date that can’t be denied. When the bottom drops out of Hannah’s world, and a killer ramps up his victim count, Hannah and fellow agent, Cooper Delaney are in a race against time to catch the killer. A bombshell revelation has Hannah and Cooper reeling after the killer’s cryptic messages seem to hint at a connection. . .to Hannah. As Hannah’s feelings for Cooper deepen, her head tells her to end things before Cooper gets hurt. But her heart, the one that threatens to betray her, doesn’t want to walk away.