Captain Harry Lewis of the British East India Company, is investigating why over 2,000 natives are missing, but encounters a deaf ear from his superior, Colonel Henderson, who is more concerned with the local English merchants' caravans which are disappearing without a trace. To appease them, Henderson agrees to appoint a man to investigate, and Lewis believes it will be him. However, he is sorely disappointed when Henderson gives the job to the newly arrived, oblivious Captain Connaught-Smith, the son of an old friend of Henderson's.