The Castle of Death

You wake up on the floor of a study next to a dead body. All the evidence points to you. Can you figure out why you did it? Or, better yet, figure out if someone else did it before the police arrive?

You can run away, or maybe solve the mystery, while staying out of the clutches of the law until you're ready. Your handy notebook will be your best friend, but you might need to pick up a few other tools of the trade while you're at it.