Sara Alderson thought she was alone.
She was wrong.
After years of living with her ability to enter other people's dreams, Sara has finally found a fragile sense of control-until the night she sees something impossible.
Someone else is there.
A woman in red, watching from inside her husband's dreams.
At first, it's just a glimpse. Then she starts appearing everywhere-inside the dreams of the people around him, changing what they see, what they feel... and what they do when they wake.
Sara isn't the only one who can walk through dreams.
And the woman in red knows exactly how to use that power.
As the consequences turn deadly, Sara realizes the truth: what happens in dreams doesn't stay there. The damage follows them back into the real world-and this time, Sara herself may not be safe.
To stop her, Sara will have to face someone who understands her ability better than she ever has.
And who has no intention of stopping.