As a result of one accident, the paths of three heroes intersect: Paul, Jacek and Christiana. Their relationships are saturated with feelings of unusually high temperature - from friendship and love to obsession and hatred. The film title of the legendary creators of "Amores Perros" is the difference between the weight of a human body before and just after death. Many people think that this difference - the title 21 grams - is the burden ... of the soul.