Driving home one rainy night, Cassie Larkin sees a man and woman fighting on the side of the road. After calling 911, the veterinarian makes a split-second decision that will throw her sedate suburban life into chaos. Against all reason and advice, she gets out of her minivan and chases after the violent man, trying to help his victim. When Cassie physically tries to stop him, he suddenly turns on her and spits out an ominous threat: "Let her die, and Ill let you live."A veterinarian trained to heal, Cassie cant let the woman die. But while shes examining the unconscious victim, the attacker steals her car. Now he has her name. Her address. And he knows about her children. Though they warn her to be careful, the police assure her that the perpetratora criminal named Carver Sweetwont get near her. Cassie isnt so sure. The next dayHalloweenher husband disappears while trick-or-treating with their six-year-old daughter. Are these disturbing events a coincidence or the beginning of a horrifying nightmare? Her husband has been growing distantis it possible hes become involved with another woman? Is Cassies confrontation with the road-side attacker connected to her husbands disappearance? With all these questions swirling in her mind Cassie can trust no one, maybe not even herself. The only thing she knows for sure is that she cant sit back while the people she loves are in danger.As she desperately searches for answers, Cassie discovers that nothing is as random as it seems, and that she is more than willing to fightto go the most terrifying extremesto save her family and her marriage.