There might be something spooky going on right now at the baby-sitters club! The baby-sitters have been getting mysterious phone calls when they're out on their jobs. When a phone rings and they pick up, there's no one on the other end of the line.

Claudia's sure it's the Phantom Caller, a jewel thief who's been operating in the area. Claudia has always liked reading mysteries, so she and the baby-sitters decide to take action—with some very mixed results!

Claudia and the Phantom Phone Calls (The Baby-Sitters Club #2: 40th Anniversary Edition) by Ann Martin offers a thrilling adventure that keeps readers on the edge of their seats.