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.

In Rome it hasn’t rained for three years and the lack of water is overturning rules and habits. Through the city dying of thirst and prohibitions moves a chorus of people, young and old, marginalised and successful, victims and profiteers. Their lives are linked in a single design, while each seeks his or her deliverance.

In Rome it hasn’t rained for three years and the lack of water is overturning rules and habits. Through the city dying of thirst and prohibitions moves a chorus of people, young and old, marginalised and successful, victims and profiteers. Their lives are linked in a single design, while each seeks his or her deliverance.