How do you live when every heartbeat could be the last? This question constantly accompanies 17-year-old Jana, because she lives with a congenital heart defect. And because that's not fair, she risks her neck and neck again and again. She wants to savor every moment. Much to the chagrin of her worried parents, who try to persuade her to have a saving but risky operation. But Jana refuses. When she meets the thoroughbred stallion Rock My Heart, everything changes for her. The two seem to be made for each other. The black horse is like her: wild, untamed, rebellious and doesn't let anyone get close to her - except Jana. Rock's trainer Paul Brenner senses his chance: He persuades Jana to train with Rock for an important gallop race in order to finally pay off his debts with the prize money. He has no idea about Jana's illness - and Jana will certainly not reveal her secret. Only her boyfriend Sami knows what risk she is taking. For Jana, Paul and Rock, the training marks the beginning of a great adventure: exciting, passionate - and life-threatening.