A routine check-up reveals that the Pilates trainer Kathrin is suffering from kidney disease and needs a transplant. Her husband Arnold is a successful architect in the middle of a large project and is afraid of donating one of his kidneys. Götz, a friend of the couple's, would undergo the operation immediately if it means saving Kathrin's life - even though this causes problems with his partner Diana. Confronted by issues of life and death, the fragility of the relationships within and between ...