"The setting is Whitby, Ontario in the summer of 1943. Two brothers, 12-year-old George and 14-year-old Jack, are left on their own a lot while their father fights overseas and their mother works in a munitions plant. As the boys explore the town they have moved to, they play war games. One game brings them to what looks like a military base. They are escorted home and ordered to stay away, but curiosity brings them back to Camp X. The boys become involved in the work of the top-secret spy camp and soon learn that everyone is under suspicion, including themselves."--Ministry of Education website.

English language arts grade 7 (2009). "The story is fictitious, but a spy camp was established by the Canadian who headed British security during the war, in Whitby in 1941. This Canadian, Sir William Stephenson, appears in the novel in a minor role as Little Bill."--Ministry of Education website.