The Papadakis family takes in a foster child, a troubled young girl named Lou, and Kristy soon discovers that Lou's difficult behavior makes her a real challenge to baby-sit.

The Papadakis family takes in a foster child, a troubled young girl named Lou, and Kristy soon discovers that Lou's difficult behavior makes her a real challenge to baby-sit.

In the landmark one-hundredth book in the series, Kristy disbands the club because of a combination of outside pressures and internal tension.

Jessi discovers that one of the girls in her dance class is anorexic, and she and her friends soon learn about the seriousness of the illness.

Mallory comes down with mono and her parents make her quit the Baby-Sitters Club.