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Fran looks into her family tree while Bernard and Manny decide to turn their bookstore into an avant-garde restaurant/bookstore.
After a minor facelift to make Black Books resemble other modern bookstores, including a coffee machine and a couch that eats people, they decide they need to go full hog and turn the bookstore into a fancy restaurant. Neither of them know how to cook.
Fran, meanwhile, uses the store's new genealogy section to track down remnants of her family tree to a freeloading family of immigrants that warm to her immediately once hearing that she owns a car and can drive them places. Though Fran is initially happy to find her roots, she soon wishes to get rid of the overbearing clan.
Meanwhile, an infestation of unknown creatures has invaded the store. Nothing is known about them, other than that they squeak, move faster than the eye can follow and have a "queen".