Luke Henderson, seller of antiquarian and rare books in York's Micklegate, is not what he seems. The bookshop is a front. Part human, part angel, Luke protects the weak, dealing out swift vengeance against evildoers, meting out his own often bloody justice. The more he lives among humans the more his supernatural powers come into conflict with his humanity and his angel superiors become concerned that he is exceeding his remit. Unless he is careful he will be withdrawn. But in the meantime Luke is falling in love with a young nightclub worker Claire, and she is caught up in a terrifying power-struggle between the club's Jordanian co-owners.