News reporter Ching met tour guide Wah during a reporting session. They developed into friendship. The husband of Ching, Chow Man Sung, a psychiatrist, disappeared suddenly at an accident. Later, Ching discovered that Wah is also Man Sung’s wife. The two didn’t know each other. Wah & Ching pretended as lunatic to enter into the Psychiatric hospital to investigate about Man Sang’s secrets. Later, Wah & Ching become partners, and find out Man Sung might have a third mistress, so they determined to seek the truth. During investigation, Wah & Ching find out they didn’t understand Man Sang and want to give up the investigation. When the two were released from the hospital, Man Sang suddenly appeared and demanded to re-unite with Ching & Wah, but the two lost interest and deserted him. Finally, Wah was arrested and mission completed.