When a charming woman and her son are in danger of robbery, an FBI agent goes undercover as an overweight grandmother to help keep them safe by staying in the same house.
FBI agent Malcolm Turner once again dons the disguise of an overweight elderly woman as he goes undercover as a nanny to the children of the suspected designer of a computer worm that creates a backdoor to critical government intelligence files.
After his stepson Trent sees a murder being committed, FBI agent Malcolm Turner steps in to protect him, and the two go on an undercover mission to an art school for girls in Georgia, where they pretend to be an old woman and her great-niece.