In the hitherto missing Sixth Mystery, Humboldt Prior, now well-established as a third-career university lecturer at the College of Information Technology, finds himself "on loan" to the prestigious Harger Business School, serving on a task force to track down $1,000,000 of lost endowment funds. As the mystery unfolds, present day murders and other crimes are compounded by those more ancient, along with the usual academic infighting and graduate student seduction attempts. Prior must employ all his skills as a former secret agent and corporate executive to solve the case without adding his name to the growing list of victims.