How do I Know you're Not a Serial Killer?

Hermione had had enough. Honestly, she'd been watching big burly men come in and out of the "shop" across from her niche little bookstore for the past few weeks and she was suspicious. It looked dodgy as hell - especially with men coming and going at all times of the day, sometimes well into the evening, and only ever one at a time. None of them ever showed up with friends or left