The Darkest Night 2 (Lords of the Underworld #1.2)

They were once the beautiful immortal warriors created by the hands of gods. But now, "love" is for them the greatest "sin," their punishment for breaking a great taboo. Before he realizes it, Maddox has fallen deeply in love with Ashlyn. However, his fellow warriors suspect that Ashlyn is a trap sent by their enemies and doubt her motives, watching her every action carefully. With the allegations that have surfaced against Ashlyn, it's looking truer than ever that love between an immortal warrior and a normal human is doomed from the start. But Maddox can neither trust her completely, nor let her get away. What will he do?