Legend's Fall by Monica Corwin
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Legend states when the legendary King Arthur is needed most he will return. What if the legends are wrong?
Maggie Sanders gave six years and two feet of her now scarred and twisted body to the United States Army. She received a thank you note and a discharge in return. Effectively booted to the curb, Maggie tries to pick up the piece of her life until her revival is interrupted by one smoking hot immortal.
Arthur Pendragon, legendary king and military leader, has been trapped on the mythical island of Avalon for 1500 years. When he is thrust from captivity to the modern world he has to fight to stay there. Too bad for him, she has more fight than he anticipates. With the help of Maggie and a teenage Merlin, Arthur sets out to end his torture and free the rest of his comrades from imprisonment.