26 books in series
The New Adventures of Mary-Kate and Ashley
The New Adventures of Mary-Kate and Ashley is a 26-book series with 26 released primary works first released in 1998 with contributions by Nina Alexander, Francess Lin Lantz, Lisa Eisenberg, June Doolittle, Judy Katschke, Cathy East Dubowski, Carol Ellis, Melinda Metz, Alice Leonhardt, Jim Thomas, Mary-Kate & Ashley Olsen, Heather Alexander, Megan Stine, and Jacqueline Carroll.
| #4 |  The Case of the Haunted Camp
| 4 | 1 read | ||
| #7 |  The Case of the Missing Mummy
| 3 | 1 read | ||
| #9 |  The Case of the Disappearing Princess
| 3 | 1 read | ||
| #10 |  The Case of the Great Elephant Escape
| 3 | 1 read | ||
| #11 |  The Case of the Summer Camp Caper The Case of the Summer Camp Caper
| 0 | 0 reads | ||
| #12 |  The Case Of The Surfing Secret
| 0 | 0 reads | ||
| #13 |  The Case of the Green Ghost The Case of the Green Ghost
| 0 | 0 reads | ||
| #15 |  The Case of the Slam Dunk Mystery The Case of the Slam Dunk Mystery
| 0 | 0 reads | ||
| #16 |  The Case of the Rock Star's Secret The Case of the Rock Star's Secret
| 0 | 0 reads | ||
| #18 |  The Case of the Flying Phantom
| 0 | 1 read | ||
| #21 |  The Case of the Flapper 'Napper The Case of the Flapper 'Napper
| 0 | 1 read | ||
| #24 |  The Case of the Dog Camp Mystery
| 0 | 1 read | ||
| #26 |  The Case of the Jingle Bell Jinx
| 0 | 1 read | ||
| #27 |  The Case of the Game Show Mystery
| 0 | 1 read | ||
| #28 |  The Case of the Mall Mystery
| 0 | 1 read | ||
| #30 |  The Case of Camp Crooked Lake
| 0 | 1 read | ||
| #31 |  The Case of the Giggling Ghost
| 0 | 1 read | ||
| #32 |  The Case of the Candy Cane Clue
| 0 | 1 read | ||
| #33 |  The Case of the Hollywood Who-Done-It
| 0 | 1 read | ||
| #35 |  The Case Of Clue's Circus Caper
| 0 | 1 read | ||
| #37 |  The Case of the Tattooed Cat
| 0 | 1 read | ||
| #38 |  The Case of the Nutcracker Ballet
| 0 | 1 read | ||
| #40 |  The Case of the Easter Egg Race
| 0 | 1 read | ||
| #42 |  The case of the cheerleading tattletale
| 0 | 0 reads | ||
| #45 |  The Case of the Icy Igloo Inn
| 0 | 1 read | ||
| #46 |  The Case of the Unicorn Mystery The Case of the Unicorn Mystery
| 0 | 1 read |