The Undying Heart by Zoe Archer

Samuel Reed had no idea magic existed, until it almost destroyed him. Thirsting for vengeance against the enemy who made him something less than human, Sam returns to England and crosses paths with Cassandra Fielding. His best friend's little sister has become a fearless woman on a dangerous mission of her own. And against all odds, she sees past what he's become, and stirs a desire he thought he'd lost forever...

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