Shaun Evans (“Endeavour,” “Vigil”) stars as John Hughes, an MI5 operative struggling with contemporary intelligence demands while his personal life crumbles.

Shaun Evans, left, as Endeavour Morse, and Roger Allam, as Fred Thursday, appear in a scene from "Endeavour," season 5.

ITV and Mammoth Screen have commenced production on 'Betrayal,' a spy thriller starring Romola Garai and Shaun Evans.

Executive producers include Mammoth’s Damien Timmer and Shaun Evans himself. “Betrayal” premieres on ITV1 and ITVX in 2026, with ITV Studios handling international distribution.