In The Black Stone, the sixth adventure of Cyrus Skeen, private detective and socialite in San Francisco, it is February 1930, marking the end of the Roaring Twenties and the beginning of the Depression and the "Red Decade," when Soviet spies and Communist fellow travelers have begun to infiltrate the government and the culture. In The Chameleon and A Crimson Overture, Skeen tangled with Nazi plotters and Communist spies. In this new case, he confronts...