She's a witch from ancient Egypt. She watched Moses kill a man and hid that knowledge. She had a spiritual experience that led her to believe that because she had chosen right, she would never die. She exalted in the knowledge.
A few thousand years later, she wants to die. She sees a raider kill a federal agent in wartime. She knows that this is her karmic chance--that if she turns in the raider she will be allowed to die.
But is she falling in love with the raider? And if she lets him live, she will keep on living, and he will die and leave her alone for thousands of years.