Michael Z. Lewin's traditional Italian family in Family Planning is really anything but - they reside in Bath, England, and run their own detective agency. And their cases are as zany as they are. Three generations of the Lunghi family live together, work together, and love together, and between their cases and personal problems they provide much more than the usual amount of trouble they find on the job..

When the Old Man takes on a challenging new case right before Christmas, things are already awfully hectic in the bustling Lunghi household. An age-old murder isn't an easy thing to solve, and the help of the entire clan is needed. However, the other family members seem to be busy solving smaller mysteries or hiding secrets of their own.