Sarah McCarthy was in love and she was happy. She only wished that the love of her life would be more open with her about his past. Or she'd thought that was what she wanted, until the night that Mark's past slammed headlong into their future. Mark Outlaw was an odd man. He was tall and handsome, and strangely, always alone. He never speaks to anyone, but for good reason. He has a secret to keep...he doesn't really exist. Mark is actually just a creation...a guard of a man named Juvenile of Ammon. A human/demon/angel hybrid, Juvenile was a breed unto himself. He was born from a Divine prophecy that made him destined to become a weapon of Hell and destroy Heaven itself. It was a prophecy he'd sworn to himself never to fulfill. Mark's job was to keep Juvenile locked inside a cell in their shared mind; to be the barrier between Juvenile and the outside world, and then Juvenile met Sarah. When Sarah was put in harm's way because of Juvenile's past, Mark knew that she would either be their salvation or their undoing. Would Mark be able to hold onto to Juvenile or would he lose him, sending Juvenile spiraling uncontrollably into a future he had spent over two thousand years running from?