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Books in The Adventures of Mary Kate and Ashley series

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  • The Case of the Mystery Cruise

    Carol Thompson

    Paperback (Scholastic Paperbacks, April 1, 1996)
    Trench Coat Twins Mary-Kate and Ashley launch their first investigation when they visit Sea World with their parents and attempt to solve the mystery of a disappearing person and a scary, black-clad lady. Original.
    N

  • The Case of the Hotel Who-Done-It: A Novelization

    Laura O'Neil

    Paperback (Scholastic Paperbacks, June 1, 1997)
    While touring Hawaii, Mary-Kate and Ashley realize that a clever thief is on the loose at their fancy hotel, stealing gold, silver, and jewels from fellow guests, and prompting the Trenchcoat Twins to hunt him down. Original.
    N

  • The Case of the Haunted Camp

    Nina Alexander

    Paperback (Scholastic Paperbacks, June 1, 1998)
    The Trenchcoat Twins return to action when their summer camp is tormented by ghostly wails outside their cabin and by rumors of a mysterious ghost stalking Camp Big Bear. Original.
    N

  • The Case of the Sea World Adventure

    Cathy East Dubowski

    Paperback (Scholastic Paperbacks, April 1, 1996)
    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.
    N

  • The Case of the Fun House Mystery

    Nancy E. Krulik, Photo Gallery

    Paperback (Scholastic Paperbacks, June 1, 1996)
    When a monster preys upon the fun house at the Tons of Fun amusement park, employees Madame Zelda, Ferris Wheel Fred, and Carousel Cal hire the twins to solve the mystery
    K

  • The Case of the Disappearing Princess

    Lisa Eisenberg

    Paperback (Scholastic Paperbacks, March 1, 1999)
    Excited to attend the Hollywood premiere of a movie about a famous Russian princess who disappeared, the twins get more than they bargained for when a priceless doll in her likeness is stolen when the lights go down. Original.

  • The Case of the Ballet Bandit

    Laura O'Neil

    Paperback (Scholastic Paperbacks, Feb. 1, 1998)
    The Trenchcoat Twins, Mary-Kate and Ashley, and their canine culprit catcher, Clue, take on the Big Apple to solve a mystery at the world-famous New York City Ballet. Original.

  • The Case of the Summer Camp Caper

    Mary-Kate & Ashley Olsen

    Paperback (HarperEntertainment, May 5, 1999)
    Trenchcoat Twins Case Report...from Mary-Kate & Ashley Ashley and I were so excited to spend the summer at Camp Wishing Well! I couldn't wait to go horseback riding. Ashley couldn't wait to go swimming. But when we got to camp, it looked like we might not get to do anything! Everyone's snacks and packages from home started disappearing. And they started showing up in my drawers...under my bed...stuffed in my sneakers. But I didn't take any of those packages! None of the other campers would talk to me. Everyone thought I was the theif! It was the first time an Olsen hired an Olsen to solve a mystery!
    R

  • New Adventures of Mary-Kate & Ashley #41: The Case of the Dog Show Mystery:

    Mary-Kate & Ashley Olsen

    Paperback (HarperEntertainment, April 27, 2004)
    We entered our basset hound, Clue, in the dog show. Everyone said she was going to win.But right before the competition, someone stole Clue!A funny smell, a puddle of drool, and a half-eaten hot dog were our only clues.Now we have to follow the clues to find Clue. Mary-Kate and I are on the case!
    O

  • Super Secret Detective Kit: Become a Super Detective-Just Like the Trenchcoat Twins

    Linda Williams Aber

    Paperback (Scholastic, April 1, 1999)
    Offers advice and tricks of the trade from the Trenchcoat Twins.
    P

  • The Case of Thorn Mansion: A Novelization

    Nina Alexander

    Paperback (Scholastic Paperbacks, Dec. 1, 1997)
    Investigating the spooky, deserted Thorn Mansion, Trenchcoat Twins Mary-Kate and Ashley seek out the truth behind such mysteries as an eerie humming noise, puddles of mysterious goo on the floor, and a strange thick fog. Original.
    N

  • The Case of the Blue-Ribbon Horse

    I. K. Swobud

    Paperback (Scholastic Paperbacks, April 1, 1998)
    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.
    O