When Alan Craven discovers a young Asian girl stowaway in his van he is inexorably drawn into a major police operation involving people smuggling, sexual exploitation and murder. Alan is attacked in the belief that he is an undercover police officer. His home is destroyed by an arsonist and he is hospitalised as a result. The criminal gang responsible have based their operations in a remote building on the North York Moors under the guise of a rest centre for tired businessmen. Alan is attacked a second time before those responsible are finally brought to justice.