The series revolves around Detective Chief Inspector Amy Dorrit (Suranne Jones), who is tasked with investigating a murder on a submarine. The story takes a complex turn as Amy navigates the claustrophobic environment of the submarine and uncovers a web of secrets and lies.

The show received generally positive reviews from critics, with praise for its unique setting, engaging storyline, and strong performances from the cast.

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The first season of "Vigil" consists of 5 episodes and follows Detective Chief Inspector Amy Dorrit as she investigates a murder on a submarine. As Amy digs deeper into the case, she uncovers a complex web of secrets and lies among the crew members. The show explores themes of trauma, mental health, and the psychological effects of isolation.