Valerie and Harvey arrive to pick up Sabrina for a trip to the aquarium, but their plans are halted when the doors seem to be stuck. Concerned, Sabrina enlists the help of her aunts who immediately realize that the house is on a magical "lock down." Zelda assumes that Hilda did not pay the house payment on time, so the two travel to the Other Realm, where they find out that their cousins locked down their house, because they want possession of the cherished magic book.
Sabrina tries to entertain Harvey and Valerie, but the pair begin to become concerned. Knowing that Valerie and Harvey cannot stay at the Spellman's for an undisclosed amount of time, Sabrina invites the feuding cousins to lunch, in hopes to work everything out. Unfortunately, one of the invitees hates mortals, so Harvey and Valerie must be kept quiet. When all else fails, Sabrina's friends are given "astonish-mints" to keep them astonished by everything.
Finally, Sabrina's great-grandmother pays a visit to the Spellman's and begs them to stop this feud, after some brutal battling. She concludes that Sabrina and her aunts are allowed to keep her magic book since the other cousins received all of her money (though they fiddled it away).