Undercurrent, DI Andy Horton at the Scene of Crime

A wet August night and Inspector Andy Horton is returning from London to Portsmouth when police cars on blue lights race past him on the motorway. Nothing unusual in that but as Horton heads for the small yacht on which he lives he sees the police vehicles pulled up outside Portsmouth's Historic Dockyard and draws to a halt.

Read about the inspiration behind Undercurrent, see the photographs and read an extract