During the occupation of Shanghai, four madames played mahjong under bright daylight lamps, their diamond rings gleaming as they shuffled the tiles. Madame Yi, the hostess, was married to the head of the intelligence agency of the Wang puppet regime; among the three guests, two were also married to officials of the Wang puppet government. The youngest, Miss Wong Ka-zhi (nominal wife of Mr. Mai), was ostensibly adopted daughter of Madame Yi. She alone did not wear a diamond ring, but her shiny red lips and her delicate six-cornered face bore up well under the harsh light, which accentuated the allure of her bosom. She had met Madame Yi two years earlier in Hong Kong. After Hong Kong fell, Mr. Mai's business came to a halt, and Miss Wong came to Shanghai on her own. Madame Yi invited her to stay with her family.
Mr. Yi, a diminutive man, stood behind his wife watching the game, and at one point he gave Miss Wong a secret signal. Pretending to have an appointment, she excused herself from the others. Taking the Yi family car, she ordered the driver to take her to a coffee shop, where she sent him back home. Then she entered the coffee shop to make a phone call, exited, and hired a rickshaw to take her to another coffee shop, Café Keseling, where she waited for someone...