The Hidden Town

Officer Hsu is found poisoned and dead in his room one night, next to him stands multiple sing-song girls who all look like the long-dead Bai Lin, they chant then vanish. Baffled by the seemingly supernatural nature of the murder, Detective Shi Shen embarks on a journey to the Hidden Town, in hopes that the mysterious practitioner Bai Tsing Luo could help him unearth the truth.
(Source: IMDb)
~~ The movie also has a 75 minutes version.