Luke and Hannah live a happy and stable life in London as they prepare for the arrival of their first child, Samuel. All his life, Luke has known he was adopted, but he’s never felt the need to seek out his birth mother --- until he becomes a father himself. His first encounter with Alice is surreal, a sharp prick that barely scratches the surface of a painful past that neither of them has fully confronted. Alice sinks into memories of her life as a young artist in 1970s London, and of her tragic whirlwind romance with an enigmatic musician who would become Luke’s father. Meanwhile, Luke spirals as he comes face to face with his feelings of abandonment that he worked so hard to bury. But at least Alice seems keen to make up for lost time by looking after Samuel --- until her doting grandmother act takes a sinister turn for the worse.