It's just a normal morning for Anna McDonald. Gym kits, packed lunches, getting everyone up and ready. Until she opens the front door to her best friend, Estelle. Anna turns to see her own husband at the top of the stairs, suitcase in hand. They're leaving together and they're taking Anna's two daughters with them. Left alone in the big, dark house, Anna can't think, she can't take it in. With her safe, predictable world shattered, she distracts herself with a story: a true-crime podcast. There's a sunken yacht in the Mediterranean, multiple murders and a hint of power and corruption. Then Anna realises she knew one of the victims in another life. She is convinced she knows what happened. Her past, so carefully hidden until now, will no longer stay silent. This is a murder she can't ignore, and she throws herself into investigating the case.