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?

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?

Someone is trying to sabotage Ashley's chances to lead the cheerleading squad.

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.

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.

When the "Spirit," a special airplane filled with gifts, goes missing from ELF Airlines on Christmas Eve, Trenchcoat Twins Mary-Kate and Ashley seek out a villain who would spoil the season for kids all over the world. Original.