Grantchester is broadcast every Sunday at 8:00 pm and is available online. Review the previous episode and other seasons.

Leonard received a letter from Daniel in prison, but he did not reply-not only because his aggressive cellmate Joe Davis took the letter and used it to cigarette. (Joe also stole Leonard’s shoes and forced him to eat barefoot.) Will witnessed drunken Daniel yelling at a man in the bar. He said the man was trying to blackmail him and exclaimed: "Why didn’t he Write to me?" Will went to visit Leonard and asked. Leonard said he needed time to reflect on his failure; he committed a crime. Will told him that he had neither failed nor committed a crime.

Will worried about Leonard and asked Jodi-he was a Burmese prisoner of war-to talk to him, but Jodi didn't want to. More serious problems will soon appear in the prison. Leonard returned to the cell and found Joe soaked and crying in the corner, saying that it was not me. The guards came in and took Joe away: another prisoner was found dead.

As the prison priest explained to Leonard after trying to raise concerns with the warden who was dismissive and insulting the warden, Joe went to jail for killing his mother. She was found drowned in a bathtub in ragged clothes; so was another prisoner, Elroy Hastings.

Leonard asked Will for help. He believed Joe's innocence statement and believed that the warden tried to keep the whole death quiet. You can't go anywhere without guards, so how did Joe manage to kill Elroy and return to his cell?

Will brought Jody, and the warden reluctantly asked them to talk to Joe who was in solitary confinement. Jody expressed sympathy for the frightened prisoner’s fear, and Joe said that he had never killed anyone—including his mother. The warden interrupted him and said that Joe was lying: he had pleaded guilty. But Joe's bruises and fear showed that the confession was coerced.

Joe's father did not remember the night his wife died, he told Will and Jody. He collapsed and only recovered his memory after receiving electric shock therapy: he saw his son holding his wife underwater.

El Roy tried to make friends with Leonard, and went to jail because he was gay. His mother visited Leonard and said that Elroy had talked about him affectionately. You should not be punished, she told Leonard. She has information—Leonard asked her to go to Will. Leonard also investigated the bathroom where El Roy died and found that the mirror was cracked, as if someone had hit it.

Mrs. Hastings told Will that she thought the prison was lying about saying that Joe was the murderer of Elroy. Recently someone tried to blackmail her, saying that he knew someone in prison who would make Elroy suffer. She did not pay him.

Will associates the threat with the threat against Daniel. He and Jody rushed into the prison together and was taken by the priest to Leonard's cell, where a prison guard named Lynch was beating and humiliating him.

Lynch had no apologies. He just makes money from criminals. But he said he didn't kill Elroy, even though he was on duty that night and needed a key to go to the bathroom. However, because of his extortion, they at least did release Joe from loneliness. Jody tells Leonard not to let the prison ruin him; he can't lose hope.

Back in an abused prison, Geordie's time in Myanmar surfaced. He and his old comrade Johnny were drunk-not the first time recently. He has forgotten his anniversary due to overeating. Johnny admitted that due to his early trauma, he almost committed suicide until he forced himself to stop remembering.

Will and Mrs. C-gaining new powers by reading Cathy's borrowed "Second Sex"-are hosting a surprise anniversary party for the Keating couple. Will persuaded the new curator Henry to come, jokingly quoting some of the duties Henry listed in the "Statement of Intent"-Will hoped Henry would relax.

Will's stepsister Tamara also showed up without an invitation. To everyone's irritation, she was driven out of her father's house by Will's mother and lived in the pastor's house. When Will pleaded for mercy from his mother, she advised him to stay away from Tamara.

Jody appeared at the party drunk, which annoyed Cathy. Cathy rescued me, he toasted and said, thinking of his war horror. He "dancing" with Tamara, then he fell on a table and hit the photo album Cathy made for him with a fist, soiling the fragments of her wedding dress used as a cover. Never do this in front of the children again, she warned him and took them out.

The next morning, Will apologized to Henry for everyone's behavior. They have been sad since losing Leonard, but if Henry accepts, they can become Henry's family. Jody wakes up one night on the sofa and tells Will that he feels the most sad about the eldest daughter Esme, who comforted her mother and siblings last night. He said that she should not be responsible to me.

Will talked to Joe's father again. His wife did not wear a wedding ring when she died-was she leaving him? He killed her, and Jean was still just a child, Joe had never experienced any provocation.

Therefore, Joe was framed in Elroy's death, by someone who knew the details of his alleged crime: his confessor priest. Leonard also realized that the pastor was behind the murder and extortion. Joe insists that the guard Lynch did not kill Elroy. Leonard realized that a wooden box owned by Elroy was engraved with "Veritas"-the truth-and some circles, showing the code for a lock. The priest has a safe in his office. Leonard opened it and found a book listing the prisoners, their relationships, and how they might be blackmailed. But when the priest caught him in the action, the priest pretended that Leonard attacked him and put him in solitary confinement.

Fortunately, Will and Jody arrested the pastor and released Leonard from loneliness. Before Joe left the prison, he returned Leonard Daniel's letter to him.

Cathy and Jody fight, including the anger he endured during the war. I will forgive you every time you mess up things, she said, citing his extramarital affairs. Jody almost hit her. Afterwards, he took out a stained note from the brim of his hat and cried bitterly while reading the list of the fallen comrades in the prisoner-of-war camp.