It's 1954 and on a sunny day, local vicar Sidney Chambers is enjoying a picnic with best friend DI Geordie Keating, Geordie's family, Sidney's shy curate and their grumpy housekeeper. Their happy day is ruined on the walk home, however, when Sidney is arrested on charges of sexual assault.
A father has read his teenage daughter, Abigail's diary, and has made the accusations against Sidney following what he's read. Abigail is missing and Sidney and Geordie know the only way to prove Sidney's innocence is to find the girl and the diary.
But when they discover she'd been spending time with a local photographer and then find Abigail's body in his studio, the case becomes even more urgent as they hunt whoever killed her and attempt to clear Sidney's name in the process. Will it damage their friendship as well as Sidney's reputation?
Grantchester, ITV, 9pm
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