Rent Agatha Christie's Poirot: Double Sin / The Adventure of The Cheap Flat (1990)

Double Sin:
Whitcombe is the place for health, but when Poirot takes Hastings on a rest cure the northern climate proves more bracing than they expect and the local inhabitants more complex than they appear.

The Adventure Of The Cheap Flat:
When the plans for a new submarine are stolen from the United States Navy, Chief Inspector Japp finds himself detailed to assist the FBI in their investigations. Despite his abhorrence of the American crime busting techniques, Poirot finds the case irresistible.