AAAA Wizardry is a short story in The Dresden Files series by Jim Butcher. It is set just after Proven Guilty. It is included in the manual Dresden Files RPG: Core Rulebook Volume 2 - Our World, and has been included in the anthology Brief Cases.
Dresden recalls an incident in Peculiar; against her brother's advice, Megan Yardly requests Dresden's help to protect her children against a boogeyman. Dresden succeeds, but discovers that the real problem lies in Megan's eldest daughter, who is a practitioner broadcasting her traumas and fears on her siblings.