As the world faced the deadliest conflict in human history, President Franklin D. Roosevelt and Prime Minister Winston Churchill recognized each other as vital allies. They sometimes disagreed politically, Al Cimino details here, but maintained the greatest affection and respect for each other, talking shop and plotting strategy as they sat up late into the night drinking. Both men were fallible, but Cimino builds a case that theirs was one of the most consequential friendships in history.