When Sylvie Patterson, a bookish student at a Northern California boarding school, falls in love with a spirited, elusive classmate named Gabe, they embark on an experiment that changes their lives. Their headmaster, Dr. Adrian Keller, is a charismatic medical researcher who has staked his career on the therapeutic potential of lucid dreaming: by teaching his patients to become conscious during sleep, he believes he can relieve stress and trauma. Over the next six years, Sylvie and Gabe become consumed by Keller's work, following him across the country.

But when an opportunity brings the trio to the Midwest, Sylvie and Gabe stumble into a tangled relationship with their mysterious neighbors--and Sylvie begins to doubt the ethics of Keller's research. As she navigates the hazy, permeable boundaries between what is real and what isn't, who can be trusted and who cannot, Sylvie also faces surprising developments in herself--an unexpected infatuation, growing paranoia, and a new sense of rebellio