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Series
Babysitters' mystery
7 books in the catalog
Book 3
Mallory and the ghost cat
Ann M. Martin
Book 4
Kristy and the missing child
Ann M. Martin
Book 5
Mary Anne and the secret in the attic
Ann M. Martin
Book 6
The Mystery at Claudia's House
Ann M. Martin
Book 10
Stacey and the mystery money
Ann M. Martin
Book 11
Claudia and the mystery at the museum
Ann M. Martin
Book 14
Stacey and the mystery at the mall
Ann M. Martin
Book data and covers from Open Library (openlibrary.org).