The Boxcar children collection 3

The mystery of the star ruby: The Aldens take part in a hunt at a gem mine and discover that someone is out to sabotage the contest. The pizza mystery: 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 radio mystery: The Alden children are helping out at a radio station, and they're going to be actors in a live mystery show. But when strange things keep happening, people in town say the station is haunted. The summer camp mystery: The Alden children look forward to friends, fun, and the annual camp Olympics at Camp Seagull, but they wonder if some campers take the competition too far when a team cheats and everything starts to go wrong.