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不可遗忘
When the remnants of a body are found hidden in a river, DCI Cassie Stuart and DS Sunny Khan are faced with an impossible investigation. David Walker disappeared in 1990 at the age of 34. Only scraps of potential leads remain, but relentless work leads Cassie and Sunny to four people. Each has a connection to Walker, and a painful secret that might have driven them to murder. They are the pieces of the jigsaw Cassie and Sunny must solve. But the harder they try to put this picture together, the more blurred it becomes. It’s a case that will test their relationship in unexpected ways.
利河清淤时发现一个行李箱，里面装着一具尸体。卡西和桑尼联手展开调查。
受害者身份确认后，卡西和桑尼随即开始追查杀害大卫·沃克的凶手。
杰森难以接受父亲的死讯。在继妹贝卡面前情绪失控后，他请求卡西让他见父亲最后一面。
萨拉向丈夫坦白了自己的过去，这在他们平静的家庭生活中激起了巨大波澜。她努力想让丈夫理解自己。
卡西将调查重点转向布伦特福德那栋房子里发生的事——一个猜测逐渐浮现：案发期间在那里的聚会中，其中一个甚至多个嫌疑人可能曾遭受过虐待。
每个嫌疑人都与大卫·沃克有着各自的动机、机会或联系。卡西和桑尼试图将这些零散的线索串联起来，找出二十五年前真正杀害他的凶手。
