Oh. Huh. Well, Numbers isn't going to turn down an invitation from Arthur to discuss 'books'. Arthur has proven himself to be a trustworthy investigative partner--he can only assume something has popped up.

Ok

I'll be there

And so he does. Before he leaves, he plucks a random book from a bookshelf and tucks it under his arm to give credence to the idea that he might be heading over to discuss book club stuff. When he arrives, he rings the doorbell and steps back. When Arthur answers the door, Numbers clears his throat and makes himself known.

"Arthur." He states the man's name in a very business-like manner. "You said you had a book you wanted to discuss?"