When Amanda's engagement ring is stolen on the night a murder is committed, Sidney and Geordie investigate whether there is a connection between the two crimes.

Sidney gives up alcohol and tries to renew his focus on clerical duties, but is dragged into another case when there are mysterious deaths in the village.

A fire in the village leads Sidney to another investigation. Meanwhile, a family crisis causes Geordie to become distracted and detached from his job.

Sidney and Geordie go for a night out at Johnny Johnson's London jazz club, but soon discover that policemen and clergymen can never truly be off duty.

With Amanda and Guy's wedding fast approaching, Sidney is thrown into crisis - is he truly cut out for life as the vicar of Grantchester?