Blighted by an eye disease, Joanna Raines undergoes a corneal transplant operation to stop her going blind. The procedure is successful, but in the weeks that follow she begins to see dark coronas surrounding certain people. By turns fearful that something has gone wrong and worried that she's going crazy, Joanna searches for an answer to the phenomena.

What she finds will change her life forever. The transplant has opened a door in her mind, and the strange coronas are not legacies of the operation but proof that a legion of demons plans to invade the earth!

Now the only thing that stands between the demonic horde and their plot to take over the world is Joanna, a young woman with the power to see them for what they really are.

Seeing is believing.

The demons are real.

Joanna just has to convince everyone else before it's too late.