Three million people upload their dreams every night. One man is collecting them. When Detective Callum Rourke is called to a Portland riverbank at dawn, he finds a young woman arranged with eerie tenderness on the gravel — eyes closed, arms crossed, as if sleeping. No signs of struggle. No obvious cause of death. Just the faint impression on her wrist where a fitness tracker used to be, and one quiet detail that refuses to leave him: she had been using DreamSync. Three million users. Every night, they trust the app with their most intimate data — biometric rhythms, eye movements, the whispered words that escape during sleep. The tagline promises peace of mind: Optimize your rest. Understand your mind. But someone else is optimizing too. As Rourke and his partner Detective Priya Osei pull the threads, they uncover a pattern as precise as it is chilling: victims who never met, connected by nothing but their sleep data — and a killer who has spent eleven months hiding inside the most private hours of people's lives. He doesn't break in. He doesn't follow. He waits for you to close your eyes. The Sleep Collector is a tightly-wound psychological thriller that asks how much we truly surrender when we hand our inner world to an algorithm — and what happens when the wrong mind is on the other side of the data. For readers of: I Am Pilgrim, The Silent Patient, and You.