Wimpy Greg Heffley, now in seventh grade, thinks he has it all together. He has mastered middle school and gotten rid of the Cheese Touch. However, Greg's older brother, Rodrick, is itching to cut him down to size. He gets the perfect opportunity when their mother tries to force the boys to bond. Rodrick may be Greg's chief tormentor, but he feels his constant pranks are just what his little brother needs to prepare him for life's hard knocks.
Overwhelmed widower Seth Webster is searching for a housekeeper to help him with his unruly six year old twin sons. "Mrs. Miracle" mysteriously appears and quickly becomes an irreplaceable nanny, chef, friend... and matchmaker.