Foul Lady Fortune

In 1932 Shanghai, exposed national spy Rosalind Lang must rescue fellow spy, Orion, whose memories of Rosalind were wiped, and find a cure to a dangerous chemical weapon before it hands in the hand of foreign invaders.

"In 1931 Shanghai, two Nationalist spies pose as a married couple to investigate a series of brutal murders causing unrest in the city"--OCLC.