本片名与另一美剧Dark Angel（末日黑天使）片名相近，但绝不是同一片，本片讲的是天使名字的吸血鬼，娇蛮任性的美女克达莉亚，以及有着神秘来历拥有预知能力的道尔（后由韦斯利替补）三人，组成了天使侦探社.
Just as Buffy was intended to capture a sense of the suburban oppression experienced by many teens, Angel depicted the feelings of loneliness, danger and callousness often attributed to the urban Los Angeles megalopolis. The divisions between the ordered world of the day and the chaotic world of the night have been trademark themes of noir and by depicting a protagonist who literally has no daytime life, the series was able to explore these same themes in more dramatic metaphorical ways.
