He is watching the walls. I am watching him.Alaric Sable hasn’t slept in fourteen months. Locked inside his isolated coastal estate, the former structural engineer has wired every hallway with pressure plates and thermal sensors to prove he isn't losing his mind. He knows someone is living inside his walls. Dr. Ophelia Ransom is a sleep clinician hired to treat his insomnia, but she quickly realizes her patient isn't delusional. The threat is real. Trapped together during a violent Pacific storm, the boundaries between clinical observation and dark obsession shatter. Alaric’s surveillance turns toward Ophelia, tracking her breaths, her sleep, and her most vulnerable moments. But the house has secrets older than Alaric's obsession. A decades-old conspiracy, a hidden architecture of deceit, and a woman who has been watching them both from the dark. To survive, Ophelia and Alaric must unravel the lies of the Saltglass Trust before the walls close in completely.