A world-weary, widowed police inspector has to break his vow of self-isolation and get back on the field after his teen daughter is arrested for the possession of a gun tied to a much-publicized murder.

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.

Don Matteo is a thoroughly ordinary Catholic priest with an extraordinary ability to read people and solve crimes. He’s a parish priest who never met an unjustly accused person he didn’t want to help.

Nearing death, videogame genius Leone Stella holds a contest to find an heir: several people named like him will compete in a live-streamed reenactment of his most famous exploits, and the winner will inherit his billion-dollar fortune.