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The prime suspects in the murder of David Walker seem to have watertight alibis despite the possibility of motives, but Cassie eventually has a breakthrough and an investigation of childhoods leads to an answer. Recap the finale of this season of Unforgotten.

Cassie and Sunny begin to uncover traumas and transgressions in the pasts of nearly everyone connected with their cold case, including the victim. David Walker had a dark life, and a new revelation against him soon transforms the entire investigation.

The midwives try to cope with a loss but can't get too wrapped up in their grief as another maternity clinic has closed and referred all its patients. One young mother is challenged to accept an unconventional living situation with her widowed father, and Monica Joan celebrates a birthday.

When a suitcase containing a body is found in a river, Cassie and Sunny begin to investigate who the corpse belongs to, and who might have murdered them. With the help of a wristwatch and a pager, they discover the identity and begin to find people connected to the victim.

Barbara is put into isolation as the hospital tries to address her dire illness. Lucille wrestles with whether to try to fit in with the English or join a West Indian church that reminds her of home. Dr. Turner helps a young man in prison who reminds him of his own son.

Another cold case sheds light on the murder of Jimmy Sullivan as everyone involved in the last days of his life begins to deal with the ramifications of their secrets and past. Cassie and Sunny struggle to decide who to trust as they finally solve the case.

The newly arrived Davidson family quickly goes from a bright future to a difficult one as disasters pile on. Sister Monica Joan makes an unlikely friend while undergoing surgery. And Valerie faces down a mother who decries her sexual health classes as filth. 

As Cassie and Sunny continue interviewing people connected to their 39-year-old cold case, they discover that everyone is rewriting their past to conceal crimes or indiscretions: an affair, an assault, a robbery, bribes, torture. But who killed Jimmy?

Fear has gripped Poplar: a Nigerian sailor may have brought smallpox to the borough, but he has disappeared and no one knows where to find him. Lucille helps a mother confront a crippling fear of giving birth, and some familiar faces return. 

When a skeleton shows up in the cellar of an old building, detectives Cassie Stuart and Sunny Khan are determined to find out who it is and who murdered them, no matter how old the case is. Their persistence is about to upend some lives that have been settled for decades.

Despite their long marriage, the Ganis face an unusual and difficult domestic situation when a new arrival appears. Fred attempts to convince Sister Monica Joan to accept medical attention for her eyesight. And Trixie continues to struggle with her breakup.

A family learns some terrible news, and Trixie is devastated that she's unable to help them more. Valerie makes a new friend, but she soon shares a difficult secret with dark complications. In lighter news, Fred and Violet throw a beauty pageant!

When a patient suffers a devastating complication, her mother blames Lucille out of racism. Valerie tries to welcome the new nurse to Nonnatus despite the prejudice of the East End. Sister Winifred opens her motherhood class to husbands.

As the record-breaking winter of 1963 continues, Nonnatus House is getting a new midwife, who, despite weather delays and illness, is quickly thrown into the thick of work. Nurse Crane tries to fend off the eviction of a dying old woman and her devoted husband.