Slaughterhouse-Five is a satirical science fiction novel by Kurt Vonnegut. The protagonist, Billy Pilgrim, becomes unstuck in time and experiences various moments of his life out of chronological order. Through Billy's journey, Vonnegut explores the horrors of war, the concept of free will, and the nature of human existence. This thought-provoking and darkly humorous book is a must-read for fans of science fiction.