Dream Demon — Anne Billson

Susan is about to marry the man she loves, so why is she having such terrible nightmares? What is the secret of the ugly old doll she finds in the basement? And who is the mysterious American girl who turns up on the doorstep of her new London home? Soon, Susan is finding it hard to distinguish dream from reality. But if she can't learn to tell them apart, she may never be able to wake up again...

From the acclaimed author of Suckers, Stiff Lips and The Ex comes the story of two young women from very different backgrounds who team up against the ancient evil attacking them through their dreams.