The halls of Bailey Elementary are sparkling clean, but the new janitor is raising some serious questions. Mr. Jolly is a cheerful, round man with a fluffy white beard who seems to have a magical touch when it comes to fixing things. He wears a red flannel shirt, hums Christmas carols in the middle of the day, and knows exactly what every student wants for the holidays. Melody, Liza, Howie, and Eddie are highly suspicious. Could this jolly old man pushing a mop down the school hallway actually be Santa Claus in disguise? The four friends team up to gather evidence and uncover the true identity of their festive new custodian. This classic holiday chapter book offers a delightful blend of seasonal magic and schoolyard sleuthing. It is a heartwarming, funny mystery that captures the spirit of the season while keeping young readers thoroughly entertained.