Senior Inspector KWONG has masterminded a dragnet to hunt down a large drug-trafficking syndicate. Meanwhile, his subordinate KAM, an experienced but hot-tempered C.I.D. has also received clues from his informant. As usual, he acts rashly before informing KWONG. This action has proven fruitless except alerting the criminals and racking KWONG's plan.

MING, a fresh high-school leaver, is very depressed after learning that her boyfriend has married another girl. CHE, her secret admirer, encourages her to join the police force. Her frankness and outstanding performance at the interview wins her a good impression from KWONG.