23 books in series

The New Adventures of Mary-Kate and Ashley

The New Adventures of Mary-Kate and Ashley is a 23-book series with 23 primary works first released in 1998 with contributions by Nina Alexander, Francess Lin Lantz, and 12 others.

The Case of the Haunted Camp
#4First

1998 • 1 Reader • 85 pages • 4

The Case of the Missing Mummy
#7

1998 • 1 Reader • 3

The Case of the Disappearing Princess
#9

1999 • 1 Reader • 85 pages • 3

The Case of the Great Elephant Escape
#10

1999 • 1 Reader • 83 pages • 3

Cover 6

The Case of the Summer Camp Caper

#11

1999 • 1 Reader

The Case Of The Surfing Secret
#12

1999 • 1 Reader

Cover 0

The Case of the Green Ghost

#13

1999 • 1 Reader

Cover 7

The Case of the Slam Dunk Mystery

#15

2000 • 1 Reader

Cover 8

The Case of the Rock Star's Secret

#16

2000 • 1 Reader

The Case of the Flying Phantom
#18Popular

2000 • 2 Readers

Cover 4

The Case of the Flapper 'Napper

#21

2001 • 1 Reader

The Case of the Dog Camp Mystery
#24

2001 • 1 Reader • 102 pages

The Case of the Jingle Bell Jinx
#26

2001 • 1 Reader • 96 pages

The Case of the Game Show Mystery
#27

2002 • 1 Reader • 100 pages

The Case of the Mall Mystery
#28

2002 • 1 Reader • 84 pages

The Case of Camp Crooked Lake
#30

2002 • 1 Reader • 79 pages

The Case of the Candy Cane Clue
#32

2002 • 1 Reader • 83 pages

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

2002 • 1 Reader

The Case of the Tattooed Cat
#37

2003 • 1 Reader

The Case of the Nutcracker Ballet
#38

2003 • 1 Reader • 85 pages

The case of the cheerleading tattletale
#42

2004 • 104 pages

The Case of the Icy Igloo Inn
#45

2002 • 1 Reader • 82 pages

The Case of the Unicorn Mystery
#46

2005 • 1 Reader • 100 pages