John Quincannon of the U. S. Secret Service has found little joy in his life since the day his stray bullet killed an innocent young woman and her unborn child. Now his country needs him again, and though his throat gets dry amd nightmares plague his soul, he's going to pursue a gang of murderous counterfeiters from San Francisco to a raw town in Idaho. He must find out who killed a harmless old prospector, make peace with attractive Pinkerton detective...

John Frederick Quincannon, a former United States Secret Service agent, and Sabina Carpenter, one of the first female Pinkerton operatives, joined forces to form the firm of Carpenter and Quincannon, Professional Detective Services. Their various cases take them all over the American West in the 1890s. Now they're back in four new adventures. In "The Bughouse Caper, " Quincannon matches wits with Sherlock Holmes to solve a series of burglaries and...

1890s San Francisco. Former Pinkerton operative Sabina Carpenter and her detective partner, ex-Secret Service agent John Quincannon, tackle two seemingly unrelated cases that are complicated by two murders and the interference of Sherlock Holmes.

Conducting a dual investigation in the opium dens of San Francisco's Chinatown, Sabina Carpenter and John Quincannon search for missing millionaires against a backdrop of a brewing Tong war.