In the autumn of 1937, when her family was in decline, Shen Niantang, the daughter of a wealthy businessman in Suzhou, unexpectedly discovered that she was not her biological child, but a party to a "suspicious child exchange" twenty years ago. In order to find out the truth, she broke into Shanghai alone, but was involved in the vortex of multiple forces: the revenge of the warlord's orphan, the intelligence network of Japanese spies, and a forbidden love spanning two generations. When the secrets were peeled away, she discovered that the key to all the mysteries was hidden in an "old Jiangnan dream" she had repeatedly - that dream was not a dream, but a tampered memory.
