ITV英剧《不可遗忘》宣布续订第4季，新季共6集，领衔,主役,担纲,主角Nicola Walker、Sanjeev Bhaskar和主创Chris Lang回归。该剧聚焦一些“不可遗忘”的旧案子，很精彩、良心的罪案类剧集。

　　本剧为北爱题材，叙述,阐述,陈述,描写了一辆从斯特兰福特湾中捞起的车中发现了疑似为自杀遗言的纸条，北爱尔兰警探Tom Brannick将其与一桩臭名昭著的悬案联系了起来，而他和这起旧案有诸多关联。这个发现引发了对一名传奇杀手持续,坚守,执着,恒心不懈的追捕。

　　Shetland returns for a new thrilling six-part tale with Douglas Henshall reprising his role as DI Jimmy Perez alongside series favourites Alison O’Donnell, Steven Robertson, Mark Bonnar, Erin Armstrong, Anne Kidd and Lewis Howden.
　　Series 6 centres on the doorstep murder of a prominent local figure, a case which strikes at the heart of the Shetland Isles and its people. As Perez and his team uncover a kaleidoscope of motives for the murder, their investigation soon takes a shockingly sinister turn.

　　本剧由《莫斯探长前传 Endeavour》主创Russell Lewis负责，改编自Peter James的「Roy Grace」小说系列。首季由2个120分钟的故事组成，分别改编自小说《Dead Simple》及《Looking Good Dead》。
　　剧集叙述,阐述,陈述,描写警司主角Roy Grace（John Simm饰）的事业因其非传统手法而处于低迷，而且妻子Sandy的失踪也一直困扰着他。此时警探Glenn Branson向他寻求协助，他手中有案件是准新郎因告别单身派对后的恶作剧而失踪；接手了案件的Roy凭着直觉﹑猜疑﹑执着而不停追查新郎的下落，并因此接触了准新娘。

　　Set in picturesque Bath, the series pairs feisty DCI McDonald, who has recently transferred from London’s Met Police, with the unassuming DS Dodds, who has been happily in the background for most of his working life. To McDonald’s surprise they form an unexpectedly effective crime solving partnership.

　　第二季叙述,阐述,陈述,描写尼基和杰森持续,延续,存续,连续在领养过程中摸索。在被领养小组批准后，他们意识到与孩子的匹配并不像他们所渴望,期望,盼望,企望的那样简易,简约,朴素,单纯。

　　Major, Carver and Kelly have gone their separate ways. Things are looking up for the AI-enhanced Major, whilst Carver is gunning for a promotion and is knee deep in a new case.