Brazilian Gold Mine Mystery

"Brazilian Gold Mine Mystery" by Andy Adams is an adventure story where a young boy named Biff Brewster joins his father in Brazil, as his father is tasked with searching for a gold mine. Biff starts out by getting a strange letter saying his father's secret mission may be dangerous for him. When he arrives in Brazil, Biff finds out his father is trying to find gold. While in Manaus, Biff finds out that danger is close by when they are almost attacked by a thief in their hotel room. Biff, together with his father, have to be careful of bad people who are after the same treasure, Nicholas Serbot.