Vigil (ITV) Season 1

Nuclear submarine Vigil is off the coast of Scotland, as part of Britain’s proactive defensive shield when a crew member dies in suspicious circumstances. Because of the location it comes under the jurisdiction of the Glasgow police and Detective Inspector Amy Silva is helicoptered to the sub to investigate, along with a replacement crew member. For security reasons she can receive messages but not send any and that’s not the least of the obstacles to her work. Ongoing fallout from a tragedy in her past severely affects her ability to operate in confined spaces and enlisting a colleague who is former lover to assist the case could hinder as much as it helps. The Navy, Police and Security Services must overcome their mutual suspicion and hostility to help Silva find a killer who threatens the nation. The always excellent Suranne Jones leads the way through six tense, action-packed episodes, supported by a strong cast of familiar faces including Rose Leslie and an almost unrecognisable Shaun Evans. Hopefully the high quality can be maintained for the recently released second season, although apparently it's still called Vigil although nowhere near the sub.