Basil of Baker Street (Library Edition)

Baker Street Mice — Beware! So far the twins are safe. They'll stay that way if you do what we say. We've decided to make your Baker Street cellar the headquarters for our gang. Everybody must be out in 48 hours. It's Basil's job to move you all out, just the way he moved you in. Better make it fast! And leave the furniture — we need it. This is the only warning you'll get. And listen — if you don't follow our orders, you'll never set eyes on those twins again!