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!

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?

The girls' friend Lindsay wants to enter her beautiful tulips in a flower contest, but someone-- or something-- ripped the flowers right off the stems. All clues point to a unicorn.

When there's a rash of missing basset hounds, the Olsen twins--along with their own crime-solving basset, Clue--help track down the missing pups. Original.

The "trenchcoat twins" learn to surf while on vacation in Southern California, but when a friend seems to have a few too many wipeouts, the twins search for a surfboard saboteur.

While having the time of their lives at summer camp, Mary-Kate and Ashley are accused of a crime they didn't commit. Someone's been stealing other campers' care packages and blaming it on them! Can the Trenchcoat Twins prove their innocence and find the real thief before they're sent home?

Ashley and I were on a ski vacation, and we couldn't wait to hit the slopes -- until we heard the scary legend of Ski Mountain. According to the story, a monster snatched a boy right off the ski slopes! The boy was never seen again. But it was just a story. Or that's what we thought. Until our ski lift stopped mysterious in midair... And the tree outside our cabin was ripped apart... And we found giant footprints in the snow. We were on the case. Was there really a Ski Mountain monster? We were about to find out -- one way or another!