Sum yuen (Forest of Death) (2007)

A homicide detective, a botanist with some unconventional theories, and his tabloid TV reporter girlfriend attempt to solve a gruesome murder in this high-concept thriller from The Eye and Bangkok Dangerous director Danny Pang. Botany student Steven is convinced that plants are sentient. He's recently written a doctorate paper on the theory, and spends much of his spare time attempting to prove that plants have a language all their own. Steven's girlfriend Mary works for a major television station, and thanks to a series of sensationalistic reports her career is on the upswing. When the Prime Minister's daughter is abducted, raped, and murdered, the police quickly arrest the prime suspect, a man named Eric. But is Eric really guilty of this heinous crime? In order to find out the truth, Steven conducts a series of tests in hopes that the forest itself may provide an eyewitness account of the brutal crime.