It's the year 1877. The Tribe of the Moon has been banished to Earth for thousands of years. But there is hope on the horizon, a chance to get home. And the people of shadow are not the only ones trying to get back. Lord Caius must enlist the help of a human girl named Alba Simon to go on a dangerous mission: find the Door and return to the homeworld. No one has ever succeeded in finding the Door. No one has ever been able to get back. That's why Caius is determined to be the first. However, someone else is trying to get to the Door first, someone with an agenda of his own. If he succeeds, it could mean death to the entire Tribe of the Moon.