"When an internet lifestyle influencer arrives on Shetland to document her 'perfect' holiday, the locals are somewhat sceptical. Joining a boat trip to the remote islands of St Kilda with sailing sleuth Cass Lynch and her partner DI Gavin Macrae, the young woman seems more concerned with her phone than the scenery. But when it's time to leave, there's no sign of her. Despite mounting a desperate search, she's seemingly vanished without trace - from a small island in the middle of the sea. As a puzzling investigation gathers pace, there are more questions than answers - and uncovering the truth will reveal dark and long-hidden secrets."--Back cover.