From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation!

Super Detectives! Karen loves solving mysteries. She even starts her own detective agency with her best friends, Nancy and Hannie. As head detective, Karen knows how to use a special Decod-R ring and how to dust for fingerprints. Being a detective is gigundo fun. But now Karen's pet rat, Emily Junior, is missing! Can Karen solve her toughest case yet?