Revelation Series by Allison Paige

It starts when the bees die and a plague sweeps across the Earth. The immune survive only to face a greater horror: a demon-ruled world where mankind is either marked or possessed.But Leah survives. For three years, she lives on her own after fleeing the fall of her city until she meets Raum, a demon who keeps her alive and unmarked. Uncertain of his motives, she follows him to Babel, even though she knows his intentions are anything but good... moreIt starts when the bees die and a plague sweeps across the Earth. The immune survive only to face a greater horror: a demon-ruled world where mankind is either marked or possessed.But Leah survives. For three years, she lives on her own after fleeing the fall of her city until she meets Raum, a demon who keeps her alive and unmarked. Uncertain of his motives, she follows him to Babel, even though she knows his intentions are anything but good.When Leah is stolen from Raum, she discovers the outside world is not what it once was, and perhaps hope for mankind is not lost. But with new hope comes consequences, and she'll have to face a nightmare far greater than anything she's ever faced before. less