I was there when it happened. I watched her disappear...  Lillian had phoned telling her to get Skype up and running. 'I have so much to tell you.' Then, the knock on the door. 'Sorry Orla, I'd better see who it is' she said. Orla waited.

Seconds became minutes. She didn't know how long she waited before she realised that something terrible had happened. For more than a decade, Lillian's disappearance has remained unsolved, and Orla has found it impossible to move on.

Then she receives an unexpected visit from Ned Moynihan, the detective who led the original investigation into her friend's vanishing. Moynihan has been receiving anonymous notes accusing him of having failed to investigate the case properly. He assumes the notes are coming from Orla, yet Orla knows nothing of these letters.

Is somebody trying to tell them the truth about what really happened to Lillian that night?

'Everything you want in a thriller' - Emma Flint, author of Little Deaths