"Friends and Foes" by Fritz Leiber is an exciting science fiction book about the adventures of two agents who represent opposing forces in the magical world. The heroes face complex moral choices, danger and intrigue, intertwined with incredible magical battles. The author Fritz Leiber successfully combined a fantasy plot with a philosophical undertone, which makes the book interesting both for fans of the genre and for those interested in the inner world of the heroes and the eternal themes of good and evil.