The fourth episode of series 1 will air on BBC One on Monday May 6th 2019 from 22.00 P.M. to 22.25 P.M. (UTC).

Summary from the BBC:

Miri is trying hard to navigate the strange new relationship with her parents, and when Oscar, still reeling from Caroline’s betrayal, feigns a migraine to get out of a family road trip, Miri must face the journey with her mother alone. While Miri relishes the opportunity of a day trip together, Caroline seems more reluctant and as the day rolls on, it becomes quite clear that she dreads spending time alone with her daughter. Miri tries to confront Caroline when suddenly, mid-argument, they hit a stumbling block in the road. Stranded in the middle of nowhere, Caroline is finally forced to admit her true feelings towards her daughter. The tense situation isn’t helped by the fact that Caroline has left her mobile phone at home and cannot call for help. Unbeknownst to her, Oscar has taken this opportunity to read her messages and find out the true identity of her secret lover. His only distraction is the mysterious Scandinavian man from the power company who’s arrived to check the meter.

Meanwhile, Mandy continues her crusade to get her best friend back, but it turns out that today isn’t any old day. It’s the anniversary of Lara’s murder, and the murky events surrounding that night are starting to come into focus.