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When Sans stumbles upon a mysterious locked door as a child, he discovers not only a best friend, but the very thing the entire Underground has been desperately searching for - a human. Even though life ends up taking an unexpected turn for the worst - like most of the Underground being drafted into the Royal Guard - Sans is determined to protect his human friend and help her get back to the surface, no matter the cost.

This series is rated Young Adult. Please review the Content Ratings page for more information.