The Bradys After a Chinese Princess; Or, The Yellow Fiends of 'Frisco

Two veteran Secret Service detectives are sent to San Francisco to investigate opium smuggling and instead uncover a web of kidnapping and organized vice. Their pursuit of a kidnapped Chinese princess leads through foggy waterfronts, Chinatown restaurants and cribs, hidden underground rooms, and a torture chamber as they trail suspicious figures and old rivals. Along the way they confront a half-Japanese physician with past ties to the Service, conduct raids and narrow escapes, and follow clues that shift into a treasure-hunting strand. The episodic narrative meshes investigative procedure, perilous infiltrations, and a culminating reckoning that ties together the various threads.