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不可遗忘
Jessica James succeeds Cassie Stuart as DCI, after two interim leaders. The detectives are on a mission to uncover the mystery behind an unsolved murder that occurred 39 years ago. Beneath the ground of a demolished house, the bones of the victim are found. With this evidence, the modern police team open a case to unearth the history that has remained buried for decades. Four main suspects emerge, and as their dark past is unraveled, the truth behind the events of the crime are finally revealed.
一栋老宅的烟囱里发现了一条断腿，警队立即着手确认死者身份。新来的杰西卡·詹姆斯警探与桑尼搭档，两人在悲痛与磨合中开始调查。
法医确认死因为枪击。受害者身份初步查明，杰西和桑尼前往告知其母亲这一噩耗，发现母女之间关系紧张。
受害者的过往浮出水面，调查逐渐指向意想不到的方向。桑尼远赴巴黎追查线索，杰西则拜访一位深居简出的勋爵，两人各自奔波，却因案件进展缓慢而冲突不断。
杰西和桑尼的个人生活双双陷入低谷，而案件本身也在考验两人的专注力。受害者的母亲和儿子因供词出现漏洞，被推至聚光灯下，成为重点调查对象。
杰西和桑尼越来越接近普雷舍丝遇害之夜的真相。然而一个惊人的发现彻底颠覆了整个案情。四名嫌疑人必须做出抉择：是继续逃避，还是直面过往？
第二名受害者浮出水面，案件性质升级为双重谋杀。杰西和桑尼必须在层层谎言中抽丝剥茧，揪出真正的凶手，让正义得以伸张。
