The longest day of the year should have been ordinary. Camilla wakes on June 21st ready to drop her infant daughter at daycare for the first time, ready to step back into her life as a literary agent after months away. But her husband Luke is gone, replaced by a cryptic note that explains nothing. Then the news breaks: a hostage situation unfolding in London. The police arrive at her door with impossible information—Luke is involved, but not as a victim. Her husband, the doting father who makes her laugh, the eternal optimist who holds their baby girl like she's made of light, is the one holding the gun. Gillian McAllister crafts a pulse-pounding thriller that asks how well we can ever truly know the people we love most. What could drive a good man to do the unthinkable? What secrets lurk beneath the surface of an ordinary marriage? As Camilla races to understand what's happening, she's forced to confront the terrifying gap between the man she thought she married and the stranger on every screen in the country. This is domestic suspense at its most visceral—a story about trust shattered in an instant and the desperate need to find answers before it's too late.