Strange Fate (Guardians #1). The Guardians, #1

Olivia thought she was doomed to spend eternity in purgatory. A punishment worse than death for saving an innocent that was destined to die. Stopping death was against the rules and breaking those rules had consequences. The higher powers decided to give Olivia a second chance to redeem herself with a new charge, little did she know this particular charge would truly make her work for her redemption and lead her back to the person she risked her life to save.
Oliver had everything going for him. A girlfriend he cared for deeply, a best friend who was following him to college and the chance to start his life. That was until one night he ran into the girl he'd been dreaming about since he was five. The beautiful blonde who saved his life thirteen years ago. Oliver can't believe she's real and can't seem to stay away from her, but their reunion isn't coincidental.
Fate has brought them back together for a reason. There is a war brewing between good and evil and destiny has chosen the only two people who can keep the balance and save the world from self-destruction. Will Oliver and Olivia be able to stop the world from diving into darkness or will they be too blinded by their own inner demons to survive what fate has in store for them?