Waking Dream — J.J. Dibenedetto

After nearly a decade of visiting other people's dreams, Sara Alderson thought she had made peace with her supernatural gift. Until one night, while watching her husband dream, she saw someone else watching him, too: a mysterious woman in a red dress. The woman in red keeps appearing in the dreams of Sara's husband and his co-workers. Sara doesn't know if this mystery woman is trying to steal her husband, drive him mad or something even worse. All she does know is that now she has something she never imagined: a nemesis. And the only thing more dangerous than a nemesis who shares her ability to step into other people's dreams, is one who knows far more about that ability and how to control it than Sara does. Waking Dream is the fifth book of the Dream Series.