The Man from Downing Street (1922)

Capt. Robert Kent is assigned by British Secret Service in India to discover the identity of a traitor responsible for a leakage in British code messages. Disguising himself as a rajah, he penetrates the most exclusive circles of Indian society. Suspicion at first falls upon Wyndham, a man of weak character, but he is mysteriously killed at the home of Colonel Wentworth, and in turn Maharajah Jehan and Captain Graves are involved. Pursuing his investigations, Kent meets Sarissa, a beautiful dancing girl--also a Secret Service agent--with whom he falls in love and whose assistance is largely responsible for his success. Following many complications, he proves the traitor to be Colonel Wentworth.