Theo is a middle-aged author with writers' block; his partner Jola is a beautiful and privileged soap star who wants very much to be taken seriously. In an attempt to save her dying career, Jola is determined to land the lead role in a new film about underwater photographer and model Lotte Hass. To improve her chances, the couple travel to Lanzarote and hire diving instructor Sven, paying him a huge sum for exclusive tuition. Sven is meticulously planning his most ambitious expedition yet - to an untouched wreck 100 metres down on the ocean floor. Diving calls for a cool head and, as a sinister love triangle develops, events rapidly get out of hand. Deliciously claustrophobic, smart, and unrelentingly intense, this psychological thriller with shades of Patricia Highsmith will leave readers gasping for air.