Here is Goodreads' synopsis of The Girl Who Loved Tom Gordon:
Nine-year-old Trisha McFarland strays from the path while she and her recently divorced mother and brother take a hike along a branch of the Appalachian Trail. Lost for days, wandering farther and farther astray, Trisha has only her portable radio for comfort. A huge fan of Tom Gordon, a Boston Red Sox relief pitcher, she listens to baseball games and fantasizes that her hero will save her. Nature isn't her only adversary, though - something dangerous may be tracking Trisha through the dark woods.
Here is Stephen King's thoughts about this news:
“I’m thrilled that my book is being brought to the screen, and that George’s company is involved. Chris (Romero) has worked long and hard to make this project happen,” said King in a statement.
Source Material: hollywoodreporter.com