Murderer Behind the Mask: Story, Cast and Series Facts

Story and premise

When a vulnerable woman goes missing in the Dublin Mountains police assume she has committed suicide. But a chance discovery by a group of fishermen, kick starts an incredible murder investigation that leads to the door of a very surprising suspect. 

Graham Dwyer is a successful architect and a happily married father of two. But he is leading a double life of twisted kinks and violent fetishes and now the police suspect, even murder. Dwyer has covered his tracks well and thinks he's got away with his crime but painstaking detective work finally unmasks the killer and puts him behind bars.

With testimony from eye witnesses and exclusive access to the Irish police force (The Garda) we hear first hand from the detectives about the incredible investigation and how they out smarted Dwyer and brought him to justice.

Series details

• Title: Murderer Behind the Mask
• Format: Documentary
• Language: English
• Genres: Crime
• Premiere date: 2025-06-21
• Final broadcast date listed: 2025-06-21
• Status in TVmaze: Ended
• Web channel listed by TVmaze: Prime Video
• Typical episode runtime: 45 minutes
• TVMaze ID: 84586
• IMDb ID: tt36581829

Seasons in the TVmaze catalogue

• Season 1: premiered 2025-06-21; final listed air date 2025-06-21; episode order: 2.

Source and licence

Adapted from Murderer Behind the Mask on TVmaze. The synopsis is reproduced as plain text; catalogue facts, cast and season records are selected and reformatted. This adapted text is available under CC BY-SA 4.0, following the TVmaze API licence. Network and web-channel credits identify the service listed in this source; they do not establish current streaming availability.