故事设定在第二季事件的152年后。

故事设定在第二季事件的152年后。

　　The series begins when suspected human remains are uncovered on Whitney Marsh - Jess and Sunny are immediately called to the scene, abandoning their evening plans to Jess’s husband’s chagrin. Dr Balcombe’s analysis reveals that the remains are relatively recent and suggest a grim conclusion: the body was placed there already dismembered. With this insight, Jess and Sunny intensify their search certain that other body parts may not be far away.　　As the investigation unfolds, viewers are introduced to a diverse new cast of characters: Melinda Ricci, an outspoken television commentator based in Ireland; Martin ‘Marty’ Baines, an autistic man living with his mother Dot in Deal, Kent; Asif Syed, an Afghan training for his UK citizenship test; and Juliet Cooper, a history lecturer and faculty head at a London university.　　While these characters live seemingly separate lives, they are intricately connected by their pasts. It’s up to Jess, Sunny, and their dedicated team to uncover these hidden links and ultimately expose the truth behind the cold case murder.

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《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。