When Ken Holt's father, the famous newspaper writer, comes home for a Christmas visit, one of the gifts he brings is an antique iron box. Soon after he arrives a serious of unexplained events occur, including an attempted burglary. A hunch that the iron box is at the center of these occurrences sends Ken Holt and his friend Sandy Allen on an exciting adventure to solve the mystery! Ken Holt was the central characters in a series of 18 mystery stories for boys written by Sam and Beryl Epstein under the pseudonym Bruce Campbell. (Summary by Maria Therese)