In the cozy paranormal mystery The Case of the Missing Mascot, amateur sleuth Sherlock Shakespeare keeps finding little piles of rocks in rooms she's searching for clues. Are they important to the case? Did the author totally just make them up over coffee one morning? Spoiler alert: The answer is no and no...and she doesn't drink coffee. Read on to learn about what those crystals in the corners mean and how people in real life use them.