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Being a spy is a new trade for James Ogilvie, now a captain in the 114th Highlanders posted on the North-West Frontier facing the Khyber Pass. But disguised as an arms seller, and accompanied by the ebullient Mr. Jones of Brum, he sets out across the Indus to woo his way into the confidence of the Pathan leaders with Gatling parts, Colts, Mausers and promises. Ogilvie finds himself in a highland world of mounting tension and expectancy. He finds, also, an unexpected ally, and when his back is to the wall he must involve the woman he loves if he is to save not so much his own skin as the whole future of the British Raj.