《神探夏洛克》第四季将于2017年元旦回归BBC1，本季依旧为三集，标题分别为：
　　第一集：六座撒切尔像（The Six Thatchers）：编剧为Mark Gatiss，导演为Rachel Talalay；
　　第二集：倒下的侦探（The Lying Detective）：编剧为Steven Moffat，导演为Nick Hurran；
　　第三集：最后的谜题（The Final Problem）：编剧为Mark Gatiss和Steven Moffat，导演为Ben Caron。

　　多米尼克（范·迪塞尔 Vin Diesel 饰）与莱蒂（米歇尔·罗德里格兹 Michelle Rodriguez 饰）共度蜜月，布莱恩与米娅退出了赛车界，这支曾环游世界的顶级飞车家族队伍的生活正渐趋平淡。然而，一位神秘女子Cipher（查理兹·塞隆 Charlize T heron 饰）的出现，令整个队伍卷入信任与背叛的危机，面临前所未有的考验。

　　吉米（查宁·塔图姆 Channing Tatum 饰）曾是风光一时的体育明星，却因为受伤而不得不告别体坛，如今的他在一家高速公路收费站里工作，生活的窘迫而又窝囊，更糟糕的是，就连这份工作最终也抛弃了他，他被解雇了。
　　心灰意冷的吉米拜访了自己的弟弟克莱德（亚当·德赖弗 Adam Driver 饰），克莱德热情的邀请哥哥加入自己抢劫高速公路的计划。为了计划能够顺利实施，兄弟两人招募了爆破专家乔（丹尼尔·克雷格 Daniel Craig 饰）加入他们的团队。就在一切计划都有条不紊的进行着的节骨眼上，他们要抢劫的那条正在施工的高速公路忽然宣布将提前完工，这也就意味着留给吉米一行人的时间不多了。

　　故事讲述每天到银行确认有没有老人金进帐的3位老人，决定受够这一切，放手一搏、携手抢银行，但他们面临到一个关键问题，他们不太会用枪……

　　Hayley Udall tries to make ends meet for herself and her 14 year-old daughter while providing alimony for a horrible ex-husband. She wishes her problems with her ex could go away, and upon venting her frustrations one night, finds herself tangled up in a pact with two people (Melanie and Kevin) to "eliminate" each other's problems. It seemed innocent wishful thinking before, but as people end up dead-including Hayley's ex-husband-Hayley is trapped to fulfill the pact or risk taking the fall for murder. She tries to clear her name but the police (led by Detective Marks) is eyeing her for her ex-husband's death as well as others. Then Melanie abducts Hayley's daughter as leverage for Hayley to follow through and kill one last person. With Detective Marks trying to find the truth, Hayley must hurry to save her daughter and find a way to avoid murder.