It's Dorset wedding bells for Keith Chitty and best man Gerry O'Dowd decides to enter into the swing of things. Gerry's taking no chances and neither is Sgt. Rockliffe. When their paths cross back in town they both get more than they bargained for.

Before Rockliffe and his team can start to look for three villains who got away they must find out who they were. It's a challenge that exercises all their ingenuity and certain members of the team have other things on their minds: three of them have selection boards for the Detective Training School.