If Birds Fly Back
Carlie Sorosiak2017

Linny's sister, Grace, ran away in the middle of the night five months ago, taking all the color with her and leaving Linny's world in black and white. to try to understand why her sister left, she keeps a Journal of Lost and Found, documenting people who disappear and then come back.
Sebastian is about to go to college to study astrophysics. He's obsessed with the mysteries of the universe, can tell you how many galaxies there are, and knows how much plutonium weighs. But the one puzzle he can't solve is the idendity of his birth father.
They've never met, but Linny and Sebastian have one thing in common: they are both fascinated by famous novelist and filmmaker Álvaro Herrera, who just reappeared in Miami for the first time since he went missing three years ago.
As their lives converge around the truth behind Álvaro's disappearance, Linny and Sebastian uncover the answers they've been searching for-and realize that maybe other people had to leave for them to find each other.

Titre original : If Birds Fly Back (2017)