Twelve-year-old Claire Barton doesn't like the "flutter feeling" that fills her chest when she worries about the future, but she knows what she loves: the land that's been in her family for three generations; her best friend Maya; her family's horses, Sunny and Sam; and her older brother Andy. That's why, with Andy recently sent to rehab and her parents planning to sell the horses, Claire's world feels like it might flutter to pieces.

When Claire learns about equine therapy, she imagines a less lonely future that keeps her family together, brother and horses included. But, when she finds what seem to be mysterious wild horses in the woods behind her house, she realizes she has a bit more company than she bargained for. With this new secret-and a little bit of luck-Claire will discover the beauty of change, the power of family, and the strength within herself.