When a young locksmith finds his way into the Merge, he discovers a parallel universe filled with an infinite number of bizarre, remarkable worlds. Setting off on the adventure of a lifetime, he soon makes allies and friends who help inform and direct him, but he must also overcome the threat of cold-blooded killers, ravenous hell jackals, evil Empresses and more. As his skills develop, he finds himself part of a perilous mission to save a realm from the forces of tyranny, but he holds the key to its success or failure, and he fears he might not be up to the task. The greatest challenge of his life awaits.