I thought this was an excellent book with an unusual angle, focusing on the tragic love Roberta/Tara felt for the evil Barch.The concept of a holographic assassin with particles of anti-matter mixed in with her energy field was very original.When Tara's primary programming kicked in and she and went on a slaughter spree against those who had been using her--yikes!I really liked the way Brigid reached her by appealing to her human counterpart's broken heart.That part of it was a real tear-jerker.This was a great book from the opening chapters in the steamy swamps of Louisana to the explosive climax in snowy Alaska.