Edward Marston 
The Enemy Within 

Pentonville Prison. Wally Hubbard is serving a long sentence for arson. But after befriending and tricking one of the officers, Hubbard makes an audacious escape. Inspector Marmion, the detective who arrested Hubbard, is warned to watch his back, but it seems that Hubbard has another target in his murderous sights.
However, the investigation is mired in confusion, the identities of killer and victim become increasingly ambiguous. An inmate at an internment camp who might be a spy sending intelligence to the Germans complicates matters further, and the multiplying manhunts, as well as Marmion's concern for his injured and withdrawn son Paul, leave the detective desperate and perhaps with too many threads to untangle.

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Edward Marston has written well over a hundred books, including some non-fiction. He is best known for his hugely successful Railway Detective series and he also writes the Bow Street Rivals series featuring twin detectives set during the Regency; the Home Front Detective novels set during the First World War; and the Ocean Liner mysteries.