BJ is pretending to be a great detective, and needs a mystery to solve! A case quickly comes his way when something nibbles on one of Baby Bop’s healthy snacks. BJ, Barney, and Baby Bop uncover several clues along the way and soon realize the “culprit” is someone’s pet rabbit. Barney sees Riff protecting a nest full of duck eggs. Together, they leave the eggs to look for food for when the ducklings hatch. When they return, Riff is pleasantly surprised to find the eggs have cracked open and the baby ducklings have hatched!