The Betrayal of Trust (Simon Serrailler, #6)

Freak weather and flash floods all over southern England. Half of Lafferton is afloat. A landslip on the Moor has closed the bypass and, as the rain slowly drains away, a shallow grave - and a skeleton - are exposed. The remains are identified as those of missing teenager, Harriet Lowther, last seen 16 years ago.