Flipping through the files in her mind she remembered. Sweet. Ravenclaw. Dark hair and with a penchant for the classic muggle crime capers.
"Of course!" she said with a smile and moved round from the desk "We've got quite a wide selection of muggle novels, and crime's something that has a good turnover. Mind if I ask what your favourite authors are? Or if there's a specific era you're fond of?"
They crossed the store to stand in front of several shelves worths of books. "They're arranged by author, I'm afraid. Well, they should be. I can't guarantee someone won't have put them back in the wrong place, but I'm sure you won't have a problem with that. Think of it as the first puzzle of your mystery."