Claudia's participation in the Baby-sitters Club is curtailed when Grandmother Mimi suffers a stroke and Claudia finds herself "Mimi-sitting" and fighting more frequently with her sister.
When a fight breaks out among the members of the Baby-sitters Club, timid Mary Anne finds herself becoming more assertive as a baby sitter and in her relationships with her father and friends.
Follows the adventures of Kristy and the other members of the Baby-sitters Club as they deal with crank calls, uncontrollable two-year-olds, wild pets, and parents who do not always tell the truth.