Purchase this book on Amazon here! If Birds Fly Back is a YA contemporary novel by Carlie Sorosiak. Ever since Linny's sister ran away, she has been obsessed by disappearances. She spends her time researching famous people who have gone missing. Sebastian, on the other hand, is more interested in scientific things. That's until he finds out the true identity of his father. Although they've never met, Linny and Sebastian are brought together when Alvaro Herrera reappears, after missing for several years. They both come to him seeking answers, but leave with more than they expect. Sex: There is sex in this book. It's not too graphic, but it's there. Language: Moderate. Drug/Alcohol Use: There is some underage drinking. Violence/Gore/Frightening Scenes/Death: There is a character that dies. Final Note: This book really fell flat for me. I wanted to like it, but it took me several days to get through it because it couldn't keep my interes...