Patty O'Leary invites all her friends, including Mary-Kate and Ashley, to a sleepover party in a toy store. When all the best toys start vanishing, the Trenchcoat Twins suspect there's an uninvited guest hiding in the store. Can they catch the thief or will Patty's party be a bust?

When the twins find giant pawprints behind the clubhouse of a dude ranch, an old ranch hand claims it is a dragon's.

Ashley and Mary-Kate are having a terrific time on a family vacation in Washington, D.C. They especially like spending time at the Smithsonian Air and Space Museum. But during their visit, the famous Wright Brothers' plane starts to tremble -- and spooky voices float down from the cockpit! Could there be a ghost in the machine? Mary-Kate and Ashley are on the case!

Mary-Kate and Ashley are excited to attend their town's annual Halloween Carnival. Every year, the carnival's proceeds go to charity -- but this year, few people are riding the rides or playing the games. That's because there's a ghost at the carnival that's scaring all the kids away! The girls must figure out who or what the spectre is -- and how to get rid of it -- or the carnival doesn’t stand a ghost of a chance!

Mary-Kate could be kicked out of the upcoming horse show if the Trenchcoat Twins do not find out who at the horseback riding school keeps putting Mary-Kate's horse in the wrong stall and feeding it the wrong food. Original.

Mary-Kate and Ashley take on the Big Apple and solve a mystery at the world-famous New York City Ballet. Spot art throughout with two full-color collectors snapshots bound in.

Super-duper pint-sized snoopers Mary-Kate and Ashley pursue a second mystery aboard a vacation cruise ship when their father's top-secret computer disk, which contains a dolphin communicator program, is stolen. Original.