Series 4

Borstal boy Roy Roper is found stabbed near his home. When Clay and Dexter arrive in the West Country to investigate, they find several suspects with strong motives for the attack, including the lad's parents.

A lorry driver is killed while trying to stop his load from theft. From evidence received and the knowledge from an informant, Clay decides it's part of a series of hijacking organised by the same gang.

Dexter investigates a burglary at an elderly couple's home. Soon afterwards, a valuable piece of Chinese porcelain is reported missing – and a burglar is found dead at the mansion of a music industry mogul.

When a teenage girl is found murdered on Hampstead Heath, businessman Herbert Morris is identified as the man seen talking to her shortly before her death. After an interrogation, Clay and Dexter clash over Morris's apparent guilt.

Joe Warner is released from prison after 15 years for armed robbery. His wife Polly has deserted him – and now he's determined to enact brutal revenge.

Two seamen steal gold bars from a makeshift strongroom as a cargo ship nears the Thames estuary. When the ship docks, Clay and Dexter investigate and find a steward has also vanished.

Dexter and Clay investigate teacher Graham Pitman's suspicious death in the science lab. But then two teenagers come forward to confess.