Texas, 1850. Robb is 13 and furious that his parents have dumped him at his uncle’s cotton plantation in order to go off and seek their fortunes. He decides to prove to everyone what he’s made of: he’ll catch a Mustang, one of the untameable wild horses that are creating panic on nearby plantations. Only with the help of Ako, a spirited Native American girl, and Aimery, a plantation slave and his childhood friend, will Robb be able to find his future.