When his kung fu master is murdered, a Chinatown Detective follows the clues to a mystical city hidden in the heart of San Francisco, and into conflict with a supernatural villain bent on world domination.
When a body mysteriously turns up on the roof of a Buddhist Temple, Detective SONNY DRAGON recognizes the deceased as his missing kung-fu teacher MASTER CHEN. After getting a tip from RUN RUN, an otherworldly boy who knows more than he should, Sonny visits the old man’s house and chases a mysterious spy to an underworld bar hidden in a dark part of Chinatown. There he meets LILLY FOX, the beautiful daughter of WEI LO, Godfather of Chinatown. But when Wei Lo recognizes Detective Dragon, supernatural kung fu action explodes, and Sonny realizes he has stepped through into a secret world very different than his own; the Hidden City, an ancient domain where all the superpowered lore of martial arts is real, and where the stakes of control will rattle the foundations of the earth.
Embroiled in interdimensional intrigue, Sonny soon finds himself taking sides against Wei Lo. Protected by Lilly and helped by sidekick TIGER JONES, Sonny realizes that Master Chen was more than just a teacher to him, but also a legendary hero, a WUXIA KNIGHT, one of many that have struggled to oppose the waxing power of Wei Lo and his evil henchman SHAN DIAN. And when Lilly is captured by Shan Dian and imprisoned for secretly opposing her father, Sonny must unlock Master Chen’s last secrets to free her and understand the purpose of the strange sword he left behind. Realizing that he has already been fully trained in the ways of the WuXia, Sonny finds the surviving knights in their secret base and rallies them to a desperate final attack on Wei Lo’s Citadel with future of both worlds hanging in the balance.