Twelve year -old Emaline is riding with her father as he discs their fields, when she sees her beloved dog Prince running dangerously close to the blades. In trying to stop him, she falls off the tractor and her leg is sliced almost completely through. In anger, her father shoots Prince and leaves home. She is rushed to hospital where a series of operations and treatments save her limb, although it is permanently shortened and she walks with a limp.

The fields need seeding. In desperation Emmy’s mother appeals to the local “mental hospital,” and Angus, the crazy man, arrives to help. Emmy is warned to stay clear of him, and neighbours gawk, but she begins to notice his special qualities. He quietly sows the fields with blue flax and yellow mustard rather than the unsellable wheat. He helps fit her with a built up shoe, and he is steadfast though frightened when falsely accused of theft. Yet some neighbours, like Harry Record, cannot adapt to Angus and believe that the family is taking risks. Just as Angus is the object of ridicule, Emmy is mercilessly teased for her deformity by Record’s son, Joey.

One night in a snowstorm both Joey and Angus disappear. Angus has been driven out of town and dumped by Harry Record, but he finds Joey lost in the storm and brings him home. Record refuses to accept his guilt and pleads not guilty. As the book ends Angus is more accepted, but a trial is looming, in which Emmy and Joey will have to give evidence against his father.