It's the Christmas season, and against his better judgement, Magnum agrees to being hired by five young schoolgirls to find their teacher, who has seemingly gone missing after falling in love. While he's working on the case, Magnum manages to convince Higgins to let the young girls stay on the Masters Estate, but he's unaware that he's being deceived in a scam over a valuable painting recently purchased by Robin Masters...

To smoke out the thief in a large family-owned business, Thomas feigns marriage to the CEO's niece, who drives a mean limousine and can't quite make up her mind how she feels about men, marriage and Magnum.