Huntington's disease is a genetic disorder with no cure: anyone with the deficient gene eventually slides into a life of chaos and madness from about the age of forty. Families often hide the illness as though a terrible secret… For several years now, a test has been able to determine 100% whether or not someone has the disease. However, many hesitate when it comes to taking the test. Is it always so easy to know your fate? The film visits a family facing this disease, meets the doctors who treat the ill people and those who conceive brain grafts to reduce their problems, and offers a scientific and human approach to the questions asked by genetic diseases.