Inspector Hartnell and Sergeant Johnson are called out to investigate a routine break-in at the home of a prominent but aging mathematician Frederick Leston. Strangely it would appear the burglars took nothing of value-just a simple folder. Even Leston cant understand why one folder would be of such interest to criminals-or so he claims. Hartnell and Johnson arent convinced and believe the old man might be hiding something but they have no idea theyre about to jump head-first into a mysterious s