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An exhausted police captain, Sam Wyndham, travels to an ashram in the Indian province of Assam to finally overcome his opium addiction and perhaps turn a new leaf in his life. But a terrifying shadow from his past, flashed in the crowd, gives impetus to his new investigation. The murderer escaped punishment many years ago, but will he succeed now - in 1922? The faithful Sergeant Banerjee will appear just in time to help finally unravel the case, the solution of which would surely have shocked Agatha Christie herself.