When Mary-Kate, Ashley, and their basset hound Clue go to Camp Barkaway, a special camp for dogs and their people, Clue disappears from their cabin and the Olsen twins must find her.

After Mary-Kate and Ashley are invited to be contestants on the TV game show, Double Trouble, things seem to go strangely wrong.

When Mary-Kate and Ashley visit the Logical I Dude Ranch, eerie noises begin to haunt them in the middle of the night, and they soon realize that the noises are coming from a dragon.

The twins help their great-grandma Olive solve a case.

"Ashley and I were planning an awesome Halloween party with our friends. But everything started going wrong. Spiders in the candy, scary warnings...we thought it was all some kind of joke. Then we heard a creepy scarecrow scream--and Ashley and I had one tricky case to crack!"

The twins try to find the missing mummy at the museum.

Ashley plans to dance in the Nutcracker Ballet, but when someone steals her friend's ballet slippers, she and Mary-Kate need to crack the case first.