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Henry's friends think he's a coward because he refuses to fight a local bully, but his reason for refusing had more to do with wanting to impress Elise, the daughter of the chemistry teacher. While in her father's lab, Elise tells Henry he misunderstood her, and points out how brave her own father is: he uses himself as a guinea pig in experiments. As Henry is holding a test tube containing his latest experimental formula, a flash of lightning scares him and he reflexively swallows the formula. Henry starts for home, but the drug starts taking affect and he wanders into Kenniston manor, a supposedly haunted house, before going home and passing out. When he awakens the next day, he has an expensive ring in his hand. He soon learns that Mr. Quid, a teacher, and Mr. Bradley, the school principal, had been in the manor at the same time he was. He also learns that Bradley has disappeared, as has the famous Kenniston ring, and that Quid has been charged in connection with these events. Afraid that, under the influence of the drug, he is responsible for Bradley's disappearance, Henry and his friends set out to discover what really happened in the haunted house.