- "You've got to be quick and tough to beat a killer at his own game."
- — Tagline, from the front cover
Illegal Procedure is the 95th book in the The Hardy Boys Casefiles series.
The Hardys have come to the West Coast for Christmas break, and they're about to tackle a case of pro football foul play. Following the suspicious death of their star player, the San Diego Sharks have hit the skids, and their owner is convinced it's a setup. The boys agree o go undercover and are soon mixing it up with some hard and heavy hitters.
Talk of contraband in the locker room, of blackmail and bribery, lead Frank and Joe to believe that a crime syndicate has infiltrated the team. Big money is at stake, and there's no telling how far the syndicate will go to protect its interests. The blitz is on, and if the Hardys don't come up with a few trick plays of their own, they could face sudden death!
- In October 2002 Illegal Procedure was reprinted in a taller format under the Archway Paperbacks imprint. However, this edition should be considered scarce, since while the book looks just like the original printing, albeit about an inch taller, this run was limited to 3000 copies, and was an accidental reprint. Simon & Schuster was reprinting Digest titles at the time and accidentally reprinted this title, along with Dead On Target in two accidental printings.