As experienced marathoner Nadia embarks on her biggest challenge yet, a 100-kilometre ultrarun, her thoughts turn to her maternal grandmother, who emigrated to the Netherlands in the early 1950s as a young widow, escaping Czechoslovakia in the aftermath of a Communist coup d'etat. As Nadia struggles with unexpected obstacles in the longest race of her life, the parallels with her grandmother become clearer. However, Nadia also realizes that Oma, now 94, has been tested far more than her granddaughter likely ever will.