TV Guide Alibi

Reports of strange lights in the sky above North Farm lead ramblers to a newly appeared crop circle where they find an unidentified man's body. Humphrey finds himself at pains to suppress conspiracy theorists speculating alien involvement while methodically pursuing the case. Meanwhile, Martha's restaurant is reviewed by an influential food critic as she misses an important IVF appointment and makes an important decision regarding plans to start a family. Detective drama set in rural Devon, starring Kris Marshall and Sally Bretton

Tracking a local conman, Frank and Lu make some unlikely allies when they encounter a pair of deadly gangsters. Mark Benton and Jo Joyner star in the comedy drama about an oddball couple of private detectives who investigate crime in Stratford-upon-Avon

Part one of two. A man is found murdered on his boat five miles out at sea, with no possible way a killer could have escaped. At first Humphrey turns his attention to the small group he was with the night before he died - but as the investigation deepens, the investigation takes an unexpected turn that requires the team to leave the comfort of their Caribbean island - and go searching for their suspects in London. Kris Marshall stars

The second of a two-part story picks up where things left off last week, with Humphrey, Florence and Dwayne having swapped the sun and sand of the Caribbean for the cold and noise of London. Their latest investigation has taken them back to the detective inspector's home town - but they've hit a brick wall with the discovery of another dead body. And now they have two murders to solve. Meanwhile, Dwayne has an emotional encounter and Humphrey receives advice from an unexpected source that helps him reach a big decision. Crime drama, starring Kris Marshall, Danny John-Jules and Josephine Jobert, with guest appearances from Ardal O'Hanlon and Sally Bretton