Chong (Lau) had to retire from police work four years ago when he was afflicted with blindness. He now pays his rent as a private detective pursuing unsolved cold cases. Although Chong may no longer "see" in the strict sense of the word, he possesses an uncanny ability to mentally project himself into crime scenes as a way of identifying with perpetrators. Ho (Cheng), meanwhile, is a young inspector, though her remarkable reflexes and aptitude for firearms defy her lack of police experience. After meeting during a bank robbery investigation, Ho and Chong begin working together on various cases, including one involving a serial killer. They turn out to make a great, if peculiar, team, staging elaborate reconstructions of crimes and donning all manner of goofy costumes as a way of "becoming" their roles — call it method sleuthing.