On her way home from Lan Sin Restaurant, Liang Li-chin is horrified to have beheld a man's body inside a private hired-car. But when she explains what she has seen to her fiance Hu Ming-lin at his Red Bat Apartment, she is no longer sure whether it was a drunkard or a corpse. But Hu is arrested by the Police as the suspected murderer of his boss Chia Lei on certain material evidences: a/ Hu's visiting card has been found near the corpse; b/ the scarf which strangled Chia to death belongs to Hu as there are his initials M. L; and c/ he has been seen to have quarreled with Chia. But somehow Hu denies he has killed Chia. Liang now recalls that she has seen a strange figure, a man, that night in the car. She is sure he was not Hu, but the Police Inspector, is not a bit convinced, especially because of her relation with the suspect, Hu. Liang feels she must act fast, if she is going to save her fiance's neck.