Dark Mirror
Diane Duane
 A series of perfect clones of members at Angel Investigations are lurking in the city, planning to kill the originals. Team Angel must find out where the replicas are coming from and why, before the murder spree hits the whole city. Thanks to Wesley's research, the gang realise that they are facing the 'Seven Sinners', dimension-jumping demons who travel to other worlds, steal the negative aspects of the souls of some of the greatest heroes of that world, and subsequently gain power by killing the originals and absorbing their souls into their power source. Once they have been copied, only the original can kill 'their' Sinner, with other attempts simply incapacitating the Sinners until they can regenerate. The Sinners have targeted Angel Investigations with the intention of duplicating Angel, as they feel that only Angelus would possess the necessary skills to lead them in their destruction of this world. However, the final seven clones- consisting of Angelus, Lorne, Wesley, Connor, Fred, Gunn, and Lilah- are all killed by their templates, Angel subsequently destroying their power source.