Reprint. Originally published: c1986. "Apple series"--P. [4] of cover. Includes an excerpt from the author's "The Baby-sitters Club #3 : the truth about Stacey".
Summary:
When Kristy, Claudia, Mary Anne, and Stacey, the members of the Baby-sitters Club, each receive mysterious calls while they are working, they decide to find out who is responsible.
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