Often though the boy had visited the island, he had never been able to escape a sensation of fear at that summons of the devotees of Voodoo. Tonight, with the mysterious disappearance of his father weighing heavily on his spirits, the roll of the black goatskin drum seemed to mock him. Hippolyte, the giant negro who had been their guide into this back-country jungle, rocked and grimaced in balance with the rhythm. "Why are they beating that drum, Hippolyte?" demanded Stuart, suddenly. "Tonight the night of the Full Moon, Yes," was the answer. "Always Voodoo feast that night. Often, queer things happen on night of Full Moon, Yes!" Stuart turned impatiently to the door, as much to get his eyes away from the hypnotic swaying of Hippolyte as to resume his watch for his father. The negro's reference to "queer things" had added to the boy's uneasiness. Little though Stuart knew about his father's affairs, he was aware that his investigations dealt with matters of grave importance to the United States. Ever since Mr. Garfield had resigned his position in the U. S. Consular Service and left the post in Cuba, where he had stayed so many years, he had kept a keen eye on international movements in the West Indies. Mr. Garfield was an ardent and flaming patriot. He believed the Monroe Doctrine with a conviction that nothing could shake. He regarded all the islands of the West Indies as properly under the sheltering wing of the United States. He looked with unfriendly eye upon the possession of certain of the islands by England, France and Holland, and especially distrusted the colonies of European powers upon South American and Central American shores. Stuart was even more intense in his patriotism. He had not lived in the United States since early childhood, and saw the country of the Stars and Stripes enhaloed by romance. Though Stuart had been brought up in Cuba, all his tastes ran to things American. He had learned to play pelota, and was a fair player, but the rare occasions when he could get a game of baseball suited him far better. He cared nothing for books unless they dealt with the United States, and then he read with avidity. Western stories fired his imagination, the more so because the life they described was so different from his own. Stuart was not the type of boy always seeking a fight, but, beneath his somewhat gentle brown eyes and dark hair, there was a square aggressive chin, revealing that trait of character known as a "terrible finisher." It took a good deal to start Stuart, but he was a terror, once started. Any criticism of the United States was enough to get him going. His Cuban schoolmates had found that out, and, whenever Stuart was around, the letters "U. S." were treated with respect.