Prime numbers are divisible only by one and themselves. These numbers are solitary and incomprehensible to others. Alice and Mattia are both "prime", both haunted by the tragedies that have marked them in childhood: a skiing accident for Alice which has caused a defect in her leg, and the loss of his twin sister for Matthew.
Saverio Costanzo
Writer, Director
Paolo Giordano
Writer

Alba Rohrwacher
Alice Della Rocca

Luca Marinelli
Mattia Balossino

Aurora Ruffino
Viola

Arianna Nastro
Alice Della Rocca (young)

Tommaso Maria Neri
Mattia Balossino (child)

Isabella Rossellini
Adele

Maurizio Donadoni
Umberto

Roberto Sbaratto
Pietro Balossino

Giorgia Senesi
Elena
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