As a string of brutal murders plague the city, two undercover detectives race to solve the mystery and unmask the killer. Their only clues: each victim is a former cop and each has a blood-red letter painted on their body. How many will have to die before the killer spells out their message in blood?
This film was completed and shown on HBO back in April 2017, it was marked as premiere of a Chinese movie made in 1973. It was not the Chinese movie which ran much longer than the runtime of 1:21 for this made for tv adult feature.