In 1960s Poland, young novitiate Anna is on the verge of taking her vows when she discovers a family secret dating back to the years of the German occupation.
A young woman witnesses a bus accident, and is caught up in the aftermath, where the question of whether or not it was intentional affects many people's lives.
In the Yorkshire countryside, working-class tomboy Mona meets the exotic, pampered Tamsin. To seal their friendship, Mona introduces Tamsin to her born-again Christian brother and helps her spy on her adulterous father. Bound together by their secrets, the two girls see their friendship deepen and enter into dangerous waters.
