Richard Osman's House of Games (2017)

S8E3 Sex and the Married Detective

A relationship counselor discovers her partner's infidelity when she returns unexpectedly and finds him with another woman. In a fit of rage, she dons a disguise and takes drastic measures against him, unaware that a romantic interest witnessed her transformation from a dark-haired woman to a blonde as she slipped into the bathroom. This twist sets the stage for unexpected complications as secrets begin to unravel.