Siblings Wednesday and Pugsley Addams will stop at nothing to get rid of Pubert, the new baby boy adored by parents Gomez and Morticia. Things go from bad to worse when the new "black widow" nanny, Debbie Jellinsky, launches her plan to add Fester to her collection of dead husbands.

After being duped and going bankrupt, model Maddie is convinced by David to become a partner in a detective agency. Together they solve various cases, while getting comfortable with each other.