For more than a decade, Lillian's disappearance has remained unsolved, and Orla has found it impossible to move on. Ned Moynihan, the detective who led the original investigation into the woman's disappearance, 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?