TV Guide Alibi Friday

When teenager Greg Lux reports that his father has been murdered in his home, the team also discovers his mother's body has been stashed in a wardrobe upstairs and soon uncovers a number of dark revelations about the seemingly perfect family. Meanwhile, Megan's love life takes a turn for the better, but Lacey is devastated when she learns the boy she has a crush on already has a girlfriend. Crime drama, starring Dana Delany and Jeri Ryan

A blind actress is the only witness to her husband's murder, but it remains to be seen whether she can really be trusted. Drama, starring Ralf Little, Aude Legastelois and Frances Tomelty

Mrs Devine and Sullivan's wedding approaches - and Father Brown finds himself having to prevent a would-be killer from ruining their big day. Fifties-set crime drama, starring Mark Williams, Claudie Blakley and Tom Chambers

A young nun is found dead in a smoke-filled bedroom in what seems like a terrible accident caused by a lit cigarette. But when Richard deduces it must have been murder, there are no shortage of suspects, including other nuns, a priest and the mother superior - as well as an unscrupulous PR man promoting a holy spring in the convent grounds. The question is, with the room locked from the inside, how could anyone have committed the crime in the first place? Kenneth Cranham, Patrick Baladi and Caroline Langrishe guest star