In Barrington House, an upmarket block in London, there is an empty apartment. No one goes in, no one comes out. And it has been that way for fifty years. Until the night watchman hears a disturbance after midnight and investigates. What he experiences is enough to change his life for ever.

A young American woman, Apryl, arrives at Barrington House. She’s been left an apartment by her mysterious Great Aunt Lillian, who died in strange circumstances. Rumours claim Lillian was mad. But her diary suggests she was implicated in a horrific and inexplicable event decades ago.

Determined to learn something of this eccentric woman, Apryl begins to unravel the hidden story of Barrington House. She discovers that a transforming, evil force still inhabits the building. And the doorway to Apartment 16 is a gateway to something altogether more terrifying . . .