Ember Series by Carol Oates

When Candra Ember wakes up in hospital after a dangerous encounter with a red-haired woman, she is shocked to discover that seeing a winged boy wasn’t her imagination. Candra is exposed to a world of rivalry and sacrifice she never knew existed, and the aftermath of a war to save humanity thousands of years ago. Soon she finds herself relentlessly stalked by Sebastian, a beautiful and arrogant Watcher Angel and romantically pursued by his darkly seductive rival, Draven... moreWhen Candra Ember wakes up in hospital after a dangerous encounter with a red-haired woman, she is shocked to discover that seeing a winged boy wasn’t her imagination. Candra is exposed to a world of rivalry and sacrifice she never knew existed, and the aftermath of a war to save humanity thousands of years ago. Soon she finds herself relentlessly stalked by Sebastian, a beautiful and arrogant Watcher Angel and romantically pursued by his darkly seductive rival, Draven. Ultimately, dubious about her own goodness, Candra’s very existence compromises a tentative peace in the city of Acheron. less

Candra dreamed of saving the world one person at a time. She never expected to become an angelic weapon and the last hope in a battle against ultimate darkness. Falling for a Nephilim wasn't part of Sebastian's plan. Distraction is something he can't afford when his rival, Draven, wants what Sebastian has. Lies, manipulation, and corruption are twisting the lives of the citizens of Acheron. The Arch is missing from heaven, and a demon is intent on claiming the city... moreCandra dreamed of saving the world one person at a time. She never expected to become an angelic weapon and the last hope in a battle against ultimate darkness. Falling for a Nephilim wasn't part of Sebastian's plan. Distraction is something he can't afford when his rival, Draven, wants what Sebastian has. Lies, manipulation, and corruption are twisting the lives of the citizens of Acheron. The Arch is missing from heaven, and a demon is intent on claiming the city. At a time they should be growing closer, grief and paranoia are driving Candra and Sebastian apart. Soon, Candra must face a terrible choice. If the price of restoring heaven is a human soul, who deserves to be saved? less