Will and Geordie are drawn into local politics when the death of a councilor prompts a parish election.

Will and Geordie negotiate a family dispute that may be connected to a murder. Meanwhile, a sinister letter arrives for Leonard.

In an all-new season of GRANTCHESTER ON MASTERPIECE it’s 1958 and trouble is brewing.

When a body is found on Jesus Green, the trail of clues leads Will and Geordie to an oppressive convent, where Will must finally confront his demons. Leonard’s father arrives in Grantchester.