SketchElder wrote:
Go to Edit Town and move another Sim into the house.
If you don't want to "Edit Town" or use cheat codes (like me), you can also go back to your home "country" and wait for the original owners to die of old age (foreign nationals only age when you're on your home lot), but that requires you to also dump the quest (and try to pick it up again later) since the sim you're supposed to take the book to will also die of old age in that time.
I prefer to try to do everything "in game" even when the game acts up.
