Cage of Dreams

Chaos reigns over the City of Newham in the thrilling conclusion to the City of Nightmares duology, by critically acclaimed author Rebecca Schaeffer. All nightmares begin as dreams. Nineteen-year-old Ness used to be terrified of Nightmares - people who'd turned into their worst fears while they slept. Now, after two assassination attempts, an explosion, and a bargain with a demon, she's finally free of her terror.
But Nightmares aren't the only dangerous thing in Newham. And Ness still has to reckon with her other fears - including her fear of mortality. It's easy to die in Newham, but hard to live. So when the monster responsible for creating Nightmares asks her for a favour, she agrees - as long as he will turn her into an indestructible Nightmare of her choice in exchange, so she can finally feel safe. Soon things spiral out of control.
Ness finds herself in the crosshairs of enemies old and new, and this time, she can't run from her problems. If she wants to survive, she's going to have to conquer the most difficult enemy of all: herself.