Luuk is a truck driver who seems to be a goodhearted father for his eight-year-old daughter Isabel. After Luuk divorced from his wife Karen, Isabel lives with her mother. Whenever Luuk has the chance he takes Isabel to the sea or for a ride in his truck, which only carries sand. On one of those occasions Luuk discovers the horrific reason why Isabel is so quiet that day. From that moment on Luuk has to cope with a new and unexpected situation. Luuk kidnaps his daughter in an attempt to protect her, but he slowly loses control.

The Story: 170 Hz is a film about unconditional love and the freedom that goes with it. Nick and Evy are two adolescents who fall hopelessly in love with each other. Their love has no voice or sound as they are both deafmute. They have their own ways of communicating with each other, so while being in love already makes them stand apart from the rest of the world, in the splendid isolation of their soundless love they distance themselves from their surroundings even more. When they sense that their parents do not fully agree with them being together, they develop an audacious plan: they will flee and hide in a special place, where Evy will become pregnant and have a baby - they are convinced that once they have a child together nothing and nobody will be able to keep them apart. Nick takes the initiative and drives off with Evy to the hiding place he has meticulously prepared, the wreck of a former Soviet submarine in a distant part of the harbour...