When their favorite pizza restaurant almost goes out of business, the Alden children try to help their friends stay open while they find out who is behind all their problems.
The Three Investigators become entangled in the theft of a string of rare pearls and a fraudulent scheme involving family inheritance when they try to solve the mystery of a ghost's appearance in the old Green Mansion.
While working with a Pittsburgh television journalist on a project to uncover the truth about the 1902 Katherine Soffel scandal, college student Dee Armstrong learns about different types of betrayal.