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Guardian of the Promise: Merlin's Descendants #4 (original 2003; edition 2004)
References to this work on external resources.
Wikipedia in English
Amazon.com Product Description (ISBN 0756401089, Mass Market Paperback)
Now in paperback, the fourth novel in Irene Radford's acclaimed saga of Merlin and his descendants follows the children of twin brothers Donovan and Griffin, in a magic-fueled struggle to protect Elizabethan England from enemies-both mortal and demonic.
(retrieved from Amazon Thu, 03 Jan 2013 21:26:03 -0500)
Book Four of Merlin's Descendants. Deirdre Kirkwood, the bastard child of Griffin, a Catholic priest, and demon-infested Roanna Douglas, has been raised with the children of Griffin's twin, Donovan. Each has inherited a powerful magical talent and a wolfhound familiar. Any of them could become the next Merlin of Britain. Deirdre's quest to know anything about her father leads to a confrontation with El Lobison the Master of all Werewolves. No one is safe from him. In and out of royal courts, the three cousins build a network of spies who are the only ones who can counter the weather, the werewolves, and the Spanish as England faces the relentless Spanish Armada.
(summary from another edition)
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