The Third Man by Graham Greene

Set in post-World War II Vienna, the story revolves around an American writer who arrives in the city to discover that his childhood friend, whom he had planned to meet, has recently died in a mysterious accident. As he delves deeper into the circumstances surrounding his friend's death, he uncovers a web of intrigue involving black market dealings, corrupt officials, and a complex moral landscape. The writer's investigation leads him to question loyalty, morality, and the ambiguous nature of friendship in a city divided by occupation and rife with espionage and criminality. The 839th greatest book of all time