The Potter family has just moved to a rented apartment in San Francisco. Harry Potter Sr. and his wife Anne are bringing the packages to the apartment and their son Harry Jr. and their little daughter Wendy Anne stays on the sidewalk. Wendy goes to the laundry room, she meets the wicked troll Torok that uses his magic ring to possess Wendy and to use her form to transform the dwellers and their apartment into other trolls and his kingdom. Harry Jr. feels that something is wrong with his sister and seeks out help with the good witch Eunice St. Clair that lives in the building.
Based on actual events of American serial killer Edmund Kemper, who murdered his grandparents at age 15 and, after being paroled for that crime, killed eight women in 1972 and 1973 including his own mother.