From the publisher:
Monte Cook and Bruce R. Cordell, in their first major collaboration, bring you The Strange. It’s an RPG set on Earth, in the modern day. But a few people—a very few people—have discovered how to travel to other places. They call them recursions, and they’re like limited pocket dimensions with their own laws of reality, connected to Earth via a dark energy network beneath the normal matter of the universe. A dangerous, chaotic network they call the Strange.