Wishbone, Joe, and their friends are helping Gladys Glendower fix up the old Moonlight Drive-in. The job gets even tougher when mysterious fires threaten to destroy the great old theater. It becomes clear that someone is trying to put the place out of business. The case gets more dangerous by the minute. But Wishbone and his friends are setermined to solve it. If something isn't done quickly to catch the culprit, the Moonlight Drive-in will be lost forever!