The Honour of His House by Fred M. White

Not a muscle of Philip's face changed. But he know that in those few boastful words his father had given him the whole key to the situation.

Those people in St. Lucia would dance to William Saltburn's tune, in other words, he had Santa Anna, the President of that disturbed revolutionary State, in his pocket. It was as plain as possible that Sherringborne had been deliberately betrayed. He had been carefully shepherded into the trap of the great British capitalist, and, undoubtedly, William Saltburn was at the bottom of the whole conspiracy.