Jonathon Prudence "Jack" McGurk is a fictional boy detective in a series of novels by Edmund Wallace Hildick.
The group of pre-teen detectives is led by 10-year-old Jack P. McGurk. Members of the McGurk Detective Agency included Joey Rockaway, Willie "The Nose" Sandowskey, Wanda Greig, "Brains" Bellingham, and later, Mari Yoshimura. The series started with The Nose Knows in 1974 (ISBN 0448057212) and continued through 24 volumes to the final adventure The Case of the Wiggling Wig in 1996 (ISBN 0689800827).