New Adventures of Mary-Kate & Ashley (Melinda Metz) Books in Order
Part ofMelinda Metz Books in OrderSee the New Adventures of Mary-Kate & Ashley books by Melinda Metz in order, with case summaries, series background, and where to start.
Last updated: July 9, 2026
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New Adventures of Mary-Kate & Ashley (Melinda Metz) books in publication order
9 books
The Case of the Surprise Call
by Melinda Metz
1999
A strange phone call pulls Mary-Kate and Ashley into another fast-moving mystery. What starts as a surprise quickly turns into a case the twins have to solve for themselves.
The Case of the Creepy Castle
by Melinda Metz
2000
Halloween at Creepy Castle should be fun, but the haunted attraction turns serious when the twins' friends start disappearing one by one. If Mary-Kate and Ashley do not crack the case, they may be next.
The Case of the Flying Phantom
by Melinda Metz
2000
On a trip to Washington, D.C., the twins visit the Air and Space Museum and run into a mystery around the Wright brothers' plane. When spooky voices float from the cockpit, Mary-Kate and Ashley go straight into detective mode.
The Case of the Golden Slipper
by Melinda Metz
2000
A fairy-tale evening turns serious when Princess Glorianna is kidnapped before a royal ball. With only a golden slipper as a clue, Mary-Kate and Ashley race to bring her back.
The Case of the Rock Star's Secret
by Melinda Metz
2000
Mary-Kate and Ashley are thrilled to be in a rock band, until sabotage hits from every direction. Black hair dye, an explosion, and missing instruments make it clear someone wants the concert stopped.
The Case of the Giggling Ghost
by Melinda Metz
2002
The town's Halloween carnival is being ruined by a ghost that keeps scaring kids away. Mary-Kate and Ashley are determined to find out who, or what, is really haunting the place.
The Case of the Hollywood Who-Done-It
by Melinda Metz
2003
A glamorous Hollywood awards show loses its sparkle when the golden statuettes disappear. Mary-Kate and Ashley trade movie-star excitement for detective work to find the thief.
The Case of the Sundae Surprise
by Melinda Metz
2003
An ice cream-making contest sounds like pure fun until trouble hits the grand opening at Sweet Sundaes. Mary-Kate and Ashley have to cool down a mystery before the celebration melts away.
The Case of the Dog Show Mystery
by Melinda Metz
2004
A visit to a dog show turns into a mystery when something goes wrong at the competition. The twins sort through anxious owners, possible rivals, and a tangle of canine clues.
New Adventures of Mary-Kate & Ashley (Melinda Metz) books in chronological order
The Case of the Surprise Call
by Melinda Metz
1999New Adventures of Mary-Kate & Ashley, Book 1
The Case of the Rock Star's Secret
by Melinda Metz
2000New Adventures of Mary-Kate & Ashley, Book 2
The Case of the Flying Phantom
by Melinda Metz
2000New Adventures of Mary-Kate & Ashley, Book 3
The Case of the Creepy Castle
by Melinda Metz
2000New Adventures of Mary-Kate & Ashley, Book 4
The Case of the Golden Slipper
by Melinda Metz
2000New Adventures of Mary-Kate & Ashley, Book 5
The Case of the Giggling Ghost
by Melinda Metz
2002New Adventures of Mary-Kate & Ashley, Book 6
The Case of the Hollywood Who-Done-It
by Melinda Metz
2003New Adventures of Mary-Kate & Ashley, Book 7
The Case of the Sundae Surprise
by Melinda Metz
2003New Adventures of Mary-Kate & Ashley, Book 8
The Case of the Dog Show Mystery
by Melinda Metz
2004New Adventures of Mary-Kate & Ashley, Book 9
Series background & context
The New Adventures of Mary-Kate & Ashley books are brisk chapter-book mysteries built around the Olsen twins' kid-detective brand. Each book drops Mary-Kate and Ashley into a fresh setting, gives them a suspicious problem, and lets them talk their way through clues, suspects, and goofy twists before the case gets away from them.
That structure is very simple, and it works.
One mystery might send them into a rock show, another to a museum, another to a royal event, a dog show, a Halloween carnival, or a Hollywood awards night. The fun is in the change of scenery. The stakes are usually light, but never so light that the girls can shrug them off. Something has gone missing, somebody is pretending, or a supposedly spooky event has a very real explanation hiding behind it.
These books were made for younger readers who want mysteries without a lot of darkness. Mary-Kate and Ashley are confident, chatty, and quick to jump into a case, which keeps the stories moving. They are not hard-boiled detectives. They are energetic kid sleuths who know how to follow a lead and keep going when adults are distracted or fooled.
There is also a strong early-2000s charm to the whole package. Celebrity culture, themed events, fun outings, and a very bright idea of adventure all shape the series. Even when the title promises ghosts or phantoms, the mood stays more playful than scary.
If you want short mysteries that are easy to dip into and centered on a familiar twin-detective duo, this series delivers exactly that. Each book is its own little case, so you can jump around, but part of the appeal is seeing how reliably Mary-Kate and Ashley turn almost any outing into an investigation.
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