Tomas asks Sabina to help Tereza find work as a photographer. Tereza is both fascinated and jealous when she grasps that Sabina and Tomas are lovers, but nevertheless still develops an affectionate friendship with Sabina. Tomas marries Tereza in a simple ceremony, with both perpetually laughing. She continues to be distressed by Tomas's promiscuity, and though she considers leaving him, she becomes more attached when the Soviet Army invades Czechoslovakia. Amid the confusion, Tereza photographs demonstrations against the Soviet forces, then hands the rolls of film to foreigners to smuggle to the West. Unwilling to face the stultifying reality that is replacing the Prague Spring, Tomas, Sabina, and Tereza flee Czechoslovakia for Switzerland; Sabina leaves first, later followed by the hesitant Tomas and Tereza.