In this dark thriller set in a seamy and sinister London, the eponymous heroine tries to discover why - and how - her best friend, Rose, a high-class prostitute, has been murdered. The only witness to Rose's death has disappeared and Mercy must turn to someone for help who himself has much to hide.
George Tiffin is a writer and film-maker. He has travelled from Siberia to the Seychelles shooting and directing music videos and commercials.
His first feature film, Soup, starred Alan Howard as God and Trevor Eve as Lucifer squabbling over the fate of a world indifferent to their ambitions.
He lives with his wife and three children in London, close to the river.