Allie is a star on the track team at Memorial Middle School, but when she passes out at a local track meet, she is diagnosed with diabetes, and afraid of what the other kids will think she tries to keep it a secret--a plan that backfires when her furtive and erratic behavior leads to rumors that she is on drugs, or worse.

Joining the Baby-sitter's Club after moving to a new town, Stacey helps her new friends outmaneuver a rival sitter group while coming to terms with her diabetes.