"Saint Jack" is a novel written by Paul Theroux that tells the story of Jack Flowers, a down-and-out American living in Singapore during the Vietnam War era. Jack is a hustler who has become an unlikely local hero, navigating the complexities of life as a bar owner and a fixer for American soldiers. His character is depicted as a blend of charm and vulnerability, showcasing the struggles of expatriates in a foreign land. The novel explores themes of identity, morality, and the impact of war on individuals. Jack's interactions with various characters, including soldiers and locals, highlight the contradictions of his life as he grapples with his own sense of purpose and belonging. The vivid portrayal of Singapore serves as a backdrop to the unfolding drama and reveals the societal tensions of the time.