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 of 26 in The New Adventures of Mary-Kate and Ashley

1998 • 1 Reader • 85 pages • 4

#7
The Case of the Missing Mummy

#7 of 26 in The New Adventures of Mary-Kate and Ashley

1998 • 1 Reader • 3

#9
The Case of the Disappearing Princess

#9 of 26 in The New Adventures of Mary-Kate and Ashley

1999 • 1 Reader • 85 pages • 3

#10
The Case of the Great Elephant Escape

#10 of 26 in The New Adventures of Mary-Kate and Ashley

1999 • 1 Reader • 83 pages • 3

#11
Cover 6

The Case of the Summer Camp Caper

#11 of 26 in The New Adventures of Mary-Kate and Ashley

1999 • 1 Reader

#12
The Case Of The Surfing Secret

#12 of 26 in The New Adventures of Mary-Kate and Ashley

1999 • 1 Reader

#13
Cover 0

The Case of the Green Ghost

#13 of 26 in The New Adventures of Mary-Kate and Ashley

1999 • 1 Reader

#15
Cover 7

The Case of the Slam Dunk Mystery

#15 of 26 in The New Adventures of Mary-Kate and Ashley

2000 • 1 Reader

#16
Cover 8

The Case of the Rock Star's Secret

#16 of 26 in The New Adventures of Mary-Kate and Ashley

2000 • 1 Reader

#18
The Case of the Flying Phantom

#18 of 26 in The New Adventures of Mary-Kate and Ashley

2000 • 2 Readers

#21
Cover 4

The Case of the Flapper 'Napper

#21 of 26 in The New Adventures of Mary-Kate and Ashley

2001 • 1 Reader

#24
The Case of the Dog Camp Mystery

#24 of 26 in The New Adventures of Mary-Kate and Ashley

2001 • 1 Reader • 102 pages

#26
The Case of the Jingle Bell Jinx

#26 of 26 in The New Adventures of Mary-Kate and Ashley

2001 • 1 Reader • 96 pages

#27
The Case of the Game Show Mystery

#27 of 26 in The New Adventures of Mary-Kate and Ashley

2002 • 1 Reader • 100 pages

#28
The Case of the Mall Mystery

#28 of 26 in The New Adventures of Mary-Kate and Ashley

2002 • 1 Reader • 84 pages

#30
The Case of Camp Crooked Lake

#30 of 26 in The New Adventures of Mary-Kate and Ashley

2002 • 1 Reader • 79 pages

#31
The Case of the Giggling Ghost

#31 of 26 in The New Adventures of Mary-Kate and Ashley

2002 • 1 Reader • 100 pages

#32
The Case of the Candy Cane Clue

#32 of 26 in The New Adventures of Mary-Kate and Ashley

2002 • 1 Reader • 83 pages

#33
The Case of the Hollywood Who-Done-It

#33 of 26 in The New Adventures of Mary-Kate and Ashley

2002 • 1 Reader

#35
The Case Of Clue's Circus Caper

#35 of 26 in The New Adventures of Mary-Kate and Ashley

2002 • 1 Reader • 100 pages

#37
The Case of the Tattooed Cat

#37 of 26 in The New Adventures of Mary-Kate and Ashley

2003 • 1 Reader

#38
The Case of the Nutcracker Ballet

#38 of 26 in The New Adventures of Mary-Kate and Ashley

2003 • 1 Reader • 85 pages

#40
The Case of the Easter Egg Race

#40 of 26 in The New Adventures of Mary-Kate and Ashley

2004 • 2 Readers • 104 pages

#42
The case of the cheerleading tattletale

#42 of 26 in The New Adventures of Mary-Kate and Ashley

2004 • 104 pages

#45
The Case of the Icy Igloo Inn

#45 of 26 in The New Adventures of Mary-Kate and Ashley

2002 • 1 Reader • 82 pages

#46
Cover 2

The Case of the Unicorn Mystery

#46 of 26 in The New Adventures of Mary-Kate and Ashley

2005 • 1 Reader