Angel is an American television series, a spin-off from the television series Buffy the Vampire Slayer. The show details the ongoing trials of Angel, a vampire whose human soul was restored to him by gypsies as a punishment for the murder of one of their own. After more than a century of murder and the torture of innocents, Angel's restored soul torments him with guilt and remorse. During the first four seasons of the show, he works as a private detective in a fictionalized version of Los Angeles, California, where he and a variety of associates work to "help the helpless", restoring the faith and saving the souls of those who have lost their way. Typically, this involves doing battle with evil demons or demonically allied humans, primarily related to Wolfram & Hart, a demonic law firm. He must also battle his own demonic nature.