[PART 1] Niklas Hochfilzer and Sophie Tiefenbach plan to marry according to his family's tradition, in a high mountain cabin. Niklas however gets hurt in a fight there with her overprotective brother Florian, who can't get over Niklas's affair with his own sports gear shop employee Lena Sahlmann. Andreas Marthaler came along as mountain guide, with Jana who is Sophie's good friend, and strains his arm saving Niklas. Meanwhile high pregnant Lena and her fiance Patrick find out her paternity test was falsified by doc Sophie Tiefenbach: not he but Niklas, whom she really loves, sired the baby, and Lena foolishly climbs after the wedding party without proper mountain gear.