There is a portal under every bed. These doorways were used a long time ago by actual monsters. This is where we get the fear of "monsters under the bed." The monsters have died off, been trapped or killed, but the portals still remain. To open a portal you need a monster key. Thousands of these keys once existed, now only three are left. One is buried at the bottom of a dark lake. One is in the hands of an old crook, with a facial twitch. And one is about to be found.