Imagine a family: a policeman father, a housewife mother and four glorious children. Now imagine how one day at a doctor's appointment, the father of the family learns that he has an incurable disease - Huntington's disease, which will destroy his body and mind in the next 15 years. Yes, the disease is genetic, which means that with a fifty percent probability, the daughter, a professional ballerina, will no longer be able to dance. And you can forget about grandchildren, because they are also at risk. How do the O'Briens live on?