Mei Xiao (Yaxi Liu) has traveled from China to Rome in search of her missing sister in Gabriele Mainetti’s genre-bending revenge movie “The Forbidden City.” Upon arriving, she immediately infiltrates a brothel owned by Mr. Wang (Shanshan Chunyu) in an impressive opening scene during which she kills a man with a broken compact disc. When she can’t find her sister in the brothel, she turns her sights toward Marcello (Enrico Borello), an Italian restaurateur whose missing father was thought to be in a relationship with Mei’s sister.