Freak weather and flash floods all over southern England. Lafferton is under water and a landslide on the Moor has closed the bypass. As the rain slowly drains away, a shallow grave - and a skeleton - are exposed; 20 years on, the remains of missing teenager Joanne Lowther have finally been uncovered. The case is re-opened and Simon Serrailler is called in as senior investigating officer. Joanne, an only child, had been on her way home from a friend's house that night. She was the daughter of a prominent local businessman, Sir John Lowther. Joanne's mother, unable to cope, killed herself 2 years after Joanne disappeared.