In a forgotten valley, on the Devon-Somerset border, the seasons unfold, marked only by the rituals of the farming calendar. Twelve-year-old Leopold Sercombe skips school to help his father, a carter. Skinny and pale, with eyes as dark as sloes, Leo dreams of a job on the Master's stud farm. As ploughs furrow the hard January fields, the Master's daughter, young Miss Charlotte, shocks the estate's tenants by wielding a gun at the annual shoot. Spring comes, Leo watches swallows build their nests, hedgerows thrum with life and days lengthen into summer. Leo is breaking a colt for his father when a boy dressed in a Homburg, breeches and riding boots appears. Peering under the stranger's hat, he discovers Charlotte. And so a friendship begins, bound by a deep love of horses, but divided by rigid social boundaries - boundaries that become increasingly difficult to navigate as they approach adolescence.