A historian at Edinburgh University, Mr Jeffreys-Jones draws the reader in with thrilling, but initially disparate, tales of German espionage.

Mr. Jeffreys-Jones, an expert on the history of intelligence and espionage, draws on newly declassified FBI documents and on the FBI’s file on Turrou. He pitches his book as a pacy spy thriller, but he lets trivial details from his documents impede the storytelling.

The cast is vivid.

... riveting.

Historian Jeffreys-Jones (We Know All About You) delivers a solid rundown of the unmasking of a German espionage network in the U.S. prior to WWII.