Eleven-year-old knuckleball pitcher Vivy Cohen, who has autism, becomes pen pals with her favorite Major League baseball player after writing a letter to him as an assignment for her social skills class.

After a string of incredibly good luck, Molly decides that she has developed magical powers--but when she finds out that her pen pal Olive has had an equally surprising run of minor disasters Molly starts to wonder if her magical good luck is somehow responsible for her friend's problems.

Pen pals Molly and Olive consider themselves best friends even though they have never actually met because Molly lives in New York City and Olive lives on a farm in Iowa--but when Olive finds a diamond bracelet in the grass the two girls start to wonder if they can finally get the money for one of them to visit the other.

Twelve-year-old Kate's idyllic life in Baton Rouge takes a drastic turn when a mysterious shoulder pain reveals she has Fibrodysplasia Ossificans Progressiva, a rare genetic disorders, challenging her to adapt with support from loved ones and a pen pal, Amie, who shares her experience with FOP.