Thirteen-year-old Eli Brennan's world collapses when his parents split, and his dad moves in with Eli's best friend, Sam, and Sam's mom. Forced to leave his hometown behind, Eli starts over in rural Montana, where everything feels wrong and nothing feels like home. Eli plans to keep his head down, hide how sick and angry he feels, and avoid anyone who tries to get close. But then Kylie Hannigan enters his life. With her wild curls, stubborn kindness, and a horse ranch, she befriends Eli and introduces him to Tucker, a tenacious buckskin Thoroughbred who takes a special liking to Eli.
Just when Eli starts to breathe again, his dad tries to repair their relationship. All the hurt Eli's been stuffing down comes roaring back. He doesn't want to forgive his dad or even Sam yet. He just wants the pain to stop. The two things that keep him going are his friendships with Kylie, Joey, and Frankie and a wild-spirited horse named Tucker at The Captain's Quarters. Will Eli learn to trust people again and heal from his parents' mistakes or will he lose everything to his anger, including his connection with Tucker?