Maddie makes a wager to David, challenging to behave like a grownup for some days. Clark Greydon is a gifted pianist with a slight problem, he's addicted to gambling. His stepmother, an unpleasant character, hires Maddie and David when crooks abduct Clark to cash a ransom. The lady tells the detectives to obtain a reduce in the ransom and she will add that to their fee.
