Books in The Adventures of Mary Kate and Ashley series

Talk about style! Ashley and I were invited to a cool costume party at the house of a famous mystery writer, Fiona O'Leary. We couldn't wait to hit the ballroom for the big 1920s dance contest.The whole flap started when Fiona's adored cat disappeared. And everyone thought our dog Clue "dunnit"! Ashley and I were sure our pooch was framed. But we'd have to prove it -- or Olsen and Olsen could end up Clue-less!

Trenchcoat TwinsCase Report...fromMary-Kate & AshleyOlsen and Olsen ahoy! Ashley and I set sail on a fantastic cruise vacation -- our whole family. The Ocean Queen had everything: pools, water slides, a video game arcade, even a Super Scavenger Hunt for the kids!But this cruise wasn't all smooth sailing. Someone was stealing the prizes for the Super Scavenger Hunt! Could we get to the bottom of this case --before the fun took a dive?

"Mary-Kate and Ashley -- I dare you to go into the haunted house!" It was Halloween, and our friend Patty was trying to scare us. Ashley and I didn't believe in ghosts, so we took Patty's dare. But when we went into the haunted house -- we saw a ghost with our very own eyes! There was no time to investigate. We had another mystery on our hands. A case of robbery -- where all the suspects were our friends! But then the clues in our new case led us right back to the haunted house! Were our two mysteries turning into one?

Mary-Kate and Ashley are thrilled about participating in an ice cream-making contest at Sweet Sundaes, an ice cream store in town. Whoever invents the best new flavor will win a free sundae-a-week for a year! The twins stir up a delicious new flavor -- Creamy Orange Choco Chunk-and everyone agrees it's the best ice cream they've ever tasted. But it looks as if the yummy new flavor is a recipe for disaster! First, the ice cream disappears. Then their secret recipe is stolen. Can Mary-Kate and Ashley find the culprit before their sweet success turns sour?

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!

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!