Three strangers awaken in a locked flat, prisoners of a terrifying captor known only as the shadow man. Elspeth, Meggy, and Xavier find themselves trapped with no knowledge of their location or the reason for their abduction. Their captor, a figure of real-world dread rather than a mere nightmare, watches their every move. To survive and escape their living hell, they must confront a dark truth that lies at the heart of their confinement.

The premise sets up a high-stakes thriller focused on psychological suspense and the fight for survival. The narrative is likely to build tension through the characters' isolation and their attempts to understand and overcome their captor's motives. The focus on a tangible threat and the uncovering of a dark truth suggests a plot-driven story with a potentially grim or shocking resolution. The confined setting and the unknown nature of the antagonist are key elements designed to create a sense of dread and urgency for the reader.