As the Reverend Will Davenport unites happy couples in holy matrimony, Detective Inspective Geordie Keating is busy as ever investigating a range of local murder cases. With a new decade just around the corner, the question of what the future holds is on everyone's minds, not least Will's, but before the 50s roll over into the swinging sixties there are some crimes to solve and some life-changing decisions to be made that might change life in Grantchester forever.