Took this book home yesterday afternoon and finished it last night. Starts with life-altering events in a little girl and boy's lives. Scarred, mentally and physically, the novel moves to when they meet and quickly through their lives. 
 Mattia and Alice, Mattia decides, are like twin primes, paired, except with one number between them and the story develops with this truth. The two move through life, connected, but separate. It's touching and sad, two people so broken.