Summary:

21 Grams tells three stories that interlock in many ways, and it treats a wide variety of subjects, as the above keywords suggest.

Nevertheless, at the center of the film, and driving its action, is Paul (Sean Penn), a man in his middle years who gets a critically needed heart transplant and then sets out to discover, against the conventions of anonymous donorship, exactly whose heart he has inherited.

Paul’s quest brings him into close and complex contact with the other two main characters and their stories--Cristina (Naomi Watts), the grieving widow of the man whose heart Paul now has, and Jack (Benicio Del Toro), a reformed ex-con who now runs his life, and his family, by strict Christian dictates, and who is, through an accident, responsible for the death of the heart donor.

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