First published in 1915, 'The Double Traitor' by E. Phillips Oppenheim is set in the weeks leading up the outbreak of WWI. Stationed in Berlin, young British diplomat Francis Norgate finds himself drawn into the world of espionage after overhearing a secret conversation on a train. Full of danger, double agents, and conflicting loyalties, this is a gripping tale, as well as a fascinating insight into the mood of the time.