"As Above, So Below" centers on two archaeologists and a group of urban spelunkers who break into the catacombs below Paris. However, unlike most naive tourists, they have quite the reason: they are in search of an arcane philosopher's stone that purportedly holds the powers of eternal life. Unfortunately, the group becomes trapped in a labyrinth of caves that lead them deeper and deeper into the earth... and closer and closer toward the gates of hell.