As summer winds down and students head back to school, we’ll join some radio detectives as they tackle cases on college campuses. Michael Shayne looks for a peeping Tom turned murderer in “The Return to Huxley College” (originally aired on Mutual on November 5, 1946), and mystery writer and amateur sleuth Dan Holiday tries to help an old friend figure out how a colleague died in “The Professor and the Puzzle” from Box 13. A murderer is supposedly dead, but someone’s spotted him on campus and it’s up to Richard Diamond, Private Detective to find him in “The Martin White Case” (originally aired on NBC on January 22, 1950). And The Saint returns to his alma mater to find the author of some poison pen letters before his works turn deadly in “Simon Carries the Ivy” (originally aired on NBC on April 1, 1951).