When the Boreson family writes a hard luck letter to Concrete, he responds with action: He agrees to work a season on their farm, bringing it into viable condition. Concrete's strength and indefatigability are a great help, and his co-signing of a loan is no less. But it isn't so easy: Larry gets involved in a romance that threatens to create hard feelings, the neighbors resent the special help the Boresons are getting, and there's something very strange about the Boresons themselves. It's up to Concrete to figure out just what their secret is...