Season 4

Can two Dartmoor convicts serving time for a payroll snatch stop Lockhart finding out where the money is stashed?

Lockhart is called in when a wealthy widow is found murdered on a Commando training beach.

Tragedy results when a gang of violent youths runs riot.

Lockhart is on the trail of a couple of vagrants who have got their hands on some 'weeping' gelignite.

Lockhart's investigation into a series of daring jewellery thefts is interrupted by a murder.