Seth Eaton, who was a pretty fair college pitcher before he was wounded in World War Two, devises a way to throw a hundred and fifteen mile an hour fastball. Since most of the energy involved in hurling a baseball is expended in the throwing motion of the arm, he overcomes this obstacle by encasing his right arm in a latex sleeve inflated with helium. Seth begins his comeback in the South Jersey Suburban Twilight League with the Collwood Bruins. Johnny Burston, the Bruins | Rubber Arm by C. Franklin Leavitt, Paperback | Indigo Chapters