There's no mistaking that glimmer in John's eyes, and Nick grins a little when he spots it. "You like surprise visits as long as they come with free coffee?" he asks, holding out the drink.

"I was nearby, working on a case," he adds, considering his next words. He doesn't really want to say 'Have you been hearing that really annoying buzzing that no one normal hears, and do you want to help me narrow down where it's coming form?' "I thought I'd stop by and see how your ears have been doing."