An Old Friend of the Family (The Dracula Series)

The Southerland family left the old world to start anew in America, but little did they know that a blood-feud, older than history itself, would follow them through the generations to come.
Kate Southerland, the first born of the latest generation of Southerlands, has been murdered, but she is not dead. Her little brother, Johnny, has also vanished, a severed, bloody finger the only clue.
But the Southerlands have no clue what they've fallen into. Their enemy is no mortal madman, but the undying mistress of evil enchantment, Morgan Le Fay, and the Southerlands are not her true target. She seeks to do battle with their protector, their defender, the only man who is capable of saving this mortal family from a war they've never realized was waged.