Andi Carter has just turned nine--which means she and her palomino, Taffy, are old enough to be a real horse-and-rider pair at last With a beautiful new saddle as a birthday present, Andi's sure she's ready to learn to trick ride like her friend Riley, even if her older brother Chad doesn't agree.
Riding to a secret spot her brother doesn't know about to practice, Andi finds a new friend to play with. But her fun friendship with Sadie is put to the test when they discover that their families are caught in a boundary dispute. Both Sadie's pa and Chad are stubborn as mules and each is convinced he's right. Can Andi and Sadie hang on to their friendship in the midst of this adult fight?