"It's too heavy to be blown off like that, the window and the desk don't sit at the right angle for that explanation to be plausible. It's unlikely that a gust could have been strong enough to move a leather notebook halfway across the room; not to mention that the book's trajectory is off as well." He started pacing, he still didn't believe Rose but he couldn't ignore her arguments either. A security breach was a big problem, he was liked by most of his neighbours, they had never failed in keeping burglars out of his shop. What had changed? Had he unwittingly upset one of the locals?
He started pacing a little "I keep that window shut, so if you didn't open it and I didn't open it, that means that someone else opened it. And while I have good reason to be worried about someone pottering around my room last night looking through my notebook, what I really want to know is why they left it lying in the middle of the floor." He locked eyes with Rose and displayed is skepticism broadly, then meaningfully attracted the metal latch to it's anchor on the windowsill and made minor adjustments to the centre of attraction until he heard the satisfying click of the latch shutting. "I really hope your not playing folly with me Rose."