Siege Perilous
By Nigel Bennett and P.N. Elrod, 2004
Series: Lord Richard, Vampire

"Vampire hero Richard Dun, once called Lancelot, is back in the latest book in this exciting, critically acclaimed fantasy series by award-winning actor Nigel Bennett and award-winning writer P.N. Elrod. An old enemy from Richard's past, Charon the Assassin, returns and is literally hell-bent on bloody revenge. He's acquired deadly new powers that are annihilating the nebulous plane of Otherside and threaten the very existence of the Realside plane. Unless balance is restored both will be destroyed. From the sultry Yucatan forests to the chill green fields of ancient Glastonbury, Richard Dun marshals his mortal and immortal allies for a fight that will span dimensions and centuries of time. He is no stranger at battling to the death, but how can one earth-bound vampire stand up to a being able to destroy the gods themselves?" (from Amazon.com)

Paperback Info: ISBN 0743488547, Baen Books