On an ordinary Monday morning, FBI crisis negotiator Mara Voss opens a package: seven photographs of strangers and a single line. *One a day. Seven days. Find the one you condemned.*
That evening, the first stranger dies at 6:03 p.m.—the exact minute of a raid that, ten years earlier, cost a teenage girl her life. Mara thought that story was buried. The killer just dug it up.
To save the six who remain, Mara has to relive the worst decision of her career: the night that, caught between two locked doors, she chose who would live. Every clue drags her toward a truth she refuses to see—the killer is no stranger at all. He's the only person she ever saved.
A relentless countdown, a chilling battle of wits, and a heroine hunted by her own guilt