Over thirty years after school-girl Amy Taskerland died at an end of term disco a time capsule is unearthed, containing a tape where she expresses fear of Alec. Neither her father William or best friend Harriet can identify Alec though Amy's headmaster falls under suspicion as he was having an affair with Amy whilst dating teacher Carla O'Brien. Then Danny discovers that Amy appears to have been reciting a speech to be used by the queen in event of nuclear war which leads to the identity of Alec and in turn to who killed Amy. Gerry meanwhile has a surprise on his future son-in-law's stag night whilst Strickland springs an even bigger surprise and Danny successfully plays Cupid for Sasha.