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A murder at a criminology conference gives the professor a chance to prove his mettle to his academic colleagues – and possibly win his job back. 

D.I. Ray begins to wonder who she can trust as she finds more links between the Chapmans and Mochanis, and possibly to the government as well.

Alphy once again finds himself in the middle of a murder investigation, but this time he's the one who continues to insert himself as he befriends Geordie. 

Professor T tries to reassemble his life, cutting off therapy and trying to protect his mother as a poisoning case hits people at random.

A figure from D.I. Ray's past surfaces with information as she tries to track down Rav Mochani and find out who killed Frank Chapman. 

The new vicar Alphy Kottaram finds a somewhat frosty, suspicious atmosphere in Grantchester, but makes a friend in Geordie as he is entwined in an investigation.

The professor is on trial, and might draw some lessons from a murder investigation he recently conducted within prison. 

With Rav Mochani kidnapped, the detectives find links between him and the murdered Frank Chapman. They try to rescue Rav while figuring out what the connections mean. 

An abandoned baby is quickly linked to a death at a hotel and leads Geordie and Will to a posh girls' school, in their last case together before Will and his family leave Grantchester. 

When a bride is found drowned in a pool the morning after her wedding, the detectives get a brief reprieve from prison for Professor T so he can help investigate. 

D.I. Ray is back from her suspension and immediately thrust into a dangerous assignment, when a local crime boss is killed outside a hospital.

The circus comes to town, but the fun is interrupted by a death. Meanwhile, Will considers moving on from Grantchester.

The professor goes to prison, where he faces danger from someone seeking vengeance. He also tries to help prove the innocence of a fellow inmate.

Max and Jake execute their final plans while everyone else also tries to come out on top during a big bank sale. Who will win out in the end?

Richard arrives on the Isle of Man, unhappy with his late wife, while his daughters continue to wrestle with their own relationship and their mother's choices.