Vigil (Seasons 1–2)

Vigil (2021) is a British crime thriller series you can watch online on iFILM. DCI Amy Silva (Suranne Jones) boards the Royal Navy's nuclear submarine HMS Vigil to investigate a crewman's unexplained death. Back on shore, a Scottish fishing trawler has vanished without a trace.

The two cases look unrelated until they don't. The Navy locks down the vessel and stonewalls every inquiry, while DS Kirsten Longacre (Rose Leslie) pursues the land-side thread alone. Layer by layer, Amy pieces together a conspiracy that runs far deeper than a routine accident — one with consequences for the UK's nuclear deterrent. The confined quarters of a submarine make every conversation a pressure test, and the claustrophobia is the point.

Directed by James Strong and Joss Agnew across two seasons, Vigil blends locked-room detective work with political stakes rarely seen in British procedurals. Stream Vigil (2021) online on iFILM.