True crime writer Britt Olsen knows the minds of monsters. She never expected to share their DNA. A simple DNA test shatters everything Britt believes about her past. The father she loved was not her biological parent, and the mother she trusted has spent decades hiding her CIA past. Worse, Britt's real father is a disgraced Mossad assassin known in the intelligence underworld as Abaddon. Before Britt can process the truth, violence strikes. Five-year-old Willow Hamilton--the president's granddaughter--is kidnapped, and Abaddon becomes the prime suspect. Determined to help rescue the child, Britt joins forces with FBI Special Agent Stein Nordahl, a man who has spent years hunting the assassin responsible for his own father's death.

As the search intensifies, Britt and Stein uncover a web of secrets that reaches deep into the intelligence world. Forced on the run through the unforgiving Pacific Northwest wilderness, they face deadly ambushes, corrupt agents, and betrayals from people they thought they could trust. But time is running out for Willow. To save the girl and stop Abaddon's catastrophic plans, Britt must confront the darkest question of all--whether she is defined by the blood in her veins or the choices she makes. Because the world's most dangerous assassin has finally come looking for his daughter. And in a battle shaped by secrets, betrayal, and faith, Britt must decide what kind of legacy she will claim.