On an online dating site, NYPD Detective Kat Donovan finds the profile of her ex-fiancé Jeff, the man who shattered her heart and who she hasn’t seen in 18 years. Kat feels a spark, wondering if this might be the moment when past tragedies recede and a new world opens up to her. But when she reaches out to the man in the profile, her reawakened hope quickly darkens into suspicion and then terror as an unspeakable conspiracy comes to light.