Well, I started reading at an unnaturally young age, and the very first books I read were detective stories. Been reading them ever since. Even had one of those phases where I wanted to be a detective. In retrospect, that may be partially responsible for my Awesomeness By Analysis moments.
Dude, having read THAT many detective books, even over a course of a life, is pretty impressive on it's own, if you ask me.
You could suspend disbelief in a story, but he's here, in our reality. I don't think it's a coincidence.
Who knows, if characters are appearing in reality, what are the odds of fictional RULES starting to play a role in our world, too, at least with regards to the fictional characters' actions? The missing person being found dead is probably not an unusual trope in that genre. Still, you're probably right, it's far more likely that this is NOT a coinscidence, which raises several questions, including WHY he was so afraid of Reynald (or possibly the professor who hired him).