'Incredibly vivid storytelling - atmospheric, dangerous and fast-paced.' ' Jasbinder Bilan, winner of the Costa Children's Book Award

In this teen historical fantasy set in nineteenth-century London, the boundary between sleep and the waking world begins to dissolve, forcing one audacious dreamer to face a reality more dangerous than any nightmare.

Sixteen-year-old Ashlyn Threadneedle lives a double life. By day she works as a government messenger for Lord Whitaker, but by night she escapes into vivid, lucid dreams, navigating the Stream ' a dreamworld in which time bends and the only limit is her imagination.

When her long-dead mother appears in a dream, secrets of the Stream are uncovered, Ashlyn's life is turned on its head, and the future of her loved ones hangs in the balance. In a quest for answers, she joins a secret society of lucid dreamers who are fighting to protect the Stream from a powerful enemy who wants to manipulate people's thoughts and seize control of London.

Ashlyn must unravel the mysteries of her family and the Stream before the freedom of thought is lost. But the Stream is a dangerous place and Ashlyn must risk both her past and future to protect the freedom of thought itself.