Henry Green loves chocolate, probably more than any boy in the history of the world. When strange brown spots start to appear all over Henry's body, he catches the attention of doctors who seem fascinated with his mysterious illness. Henry finds out that he has what appears to be the only ever recorded case of Chocolate Fever. He soon grows shy of the doctors and runs away from the hospital, but finds himself in even more trouble in the middle of an unusual hijacking. Henry learns his lesson after running into a few unexpected characters.