After surviving a bloody raid by fierce mutants, a twist of fate brings orphaned country boy Thomas Yourg to Parthagon, the kingdom’s forbidden capital. All inhabitants of the ideal city are happy and wealthy, and their entire lives revolve around a mysterious practice. Now a grown man, Thomas dreams of becoming a knight in order to avenge his family’s murder, but his path is beset by a large number of obstacles, oddities, and puzzles—foremost among them, a mystery hidden in one of the towers of the king’s castle.