Book excerpt: It is the eve of World War II. When a draft board insists on registering young men from the Tohono O'odham Reservation, a conservative traditionalist named Pia Machita raises the Mexican flag and refuses to allow his followers to "sigh paper." Roswell Manuel is one of the first Tohono O'odham to be educated by Presbyterian missionaries. As the first O'odham interpreter, policeman, judge, and Presbyterian Elder, he attempts to balance his traditional beliefs with a modern lifestyle. After U.S. Marshals invade Pia's village -- and find it empty -- it is up to Roswell to talk Pia into a peaceful surrender. In Saguaro's Shadow is full of surprises and unforgettable outcomes. Based on real-life events, the story enables readers to experience the tragedy and humor that arise when cultures collide.