《比利小子》讲述现实人物 - 法外之徒「比利小子/Henry McCarty」在美国当牛仔兼枪手，卷入林肯郡战争的故事。
改编自Kristin Hannah的同名畅销小说，Katherine Heigl和Sarah Chalke主演。剧集讲述了两个好朋友三十年一路相伴走来的故事。 原著小说还有第二本《再见，萤火虫小巷 Fly Away》。
An epic romantic adventure based on the life of Billy the Kid, from his humble Irish roots and his early days as a cowboy and gunslinger in the American frontier, to his pivotal role in the Lincoln County War and beyond.