Tsui Hark's flamboyantly staged prequel to "Detective Dee and the Mystery of the Phantom Flame," filled with fanciful special effects and spectacular action choreography, finds young 7th-century sleuth Dee Renjie (Mark Chao) joining the Imperial police force and taking on his first baffling case with reports of a sea monster menacing the town. Soon, Dee uncovers a nefarious scheme to assassinate the royal family and bring the entire kingdom to its knees. Angelababy, Kun Chen, and Carina Lau co-star. 134 min. Widescreen (Enhanced); Soundtrack: Mandarin; Subtitles: English. In Mandarin with English subtitles.