《不可遗忘》第五季获得预订，将于2023年播出，Sanjeev Bhaskar回归出演DI Sunil 'Sunny' Khan，因第四季最后一集中发生的事件，Nicola Walker将不会再出演DCI Cassie Stuart这一角色，本季中Sunny的新搭档是由Sinéad Keenan扮演的DCI Jessica James，她将接替Nicola Walker的角色和Sunny一起调查一桩全新的旧案。

A shy teenager accidentally kills a mocking peer, and his mother helps him hide in a spare room in their house. Problems arise when the mother goes for an operation and dies, and the house is sold to a new family, with the teen still living inside. Written by Kyle Palkowski　　Scott Jacoby, a nerdy high school youth, accidently kills a neighbor's young daughter. Panicking mother, Kim Hunter, fears the police will not believe that it was an accident. She moves her son into a bathroom that she turned into a secret hiding place. After her death, a new family moves in. In the mean time, Ronald has gotten lost in a fantasy world created in his own head from being hidden away for so long. Written by Humberto Amador

Jennifer uses her intuitive skills to investigate her friend's death in a multimillion-dollar home with a dark history.

塔拉对班卓琴十分热爱，她对艺术家克里斯十分看重，为此她从纽约一路来到孟买。想要把克里斯的音乐带上国际舞台，但基于不同的经济状况和社会背景，塔拉能成功吗？