Night Warden - Dark Dreamer, #3

The Nightmare Lord has fallen. The usurper, beaten. Now darker forces rise. Nora accepted her role as the Lady of Nightmares. With the Nightmare Kail at her side, she's even managed to excel, but past mistakes refuse to stay quiet. Not only is the Weaver narrating Nora's every move, but Mara-the Ancient that hitched a ride back to the Nightmare Realm-is intent on opening the Ever Safe. The Sandman is doing his best to plan Mara's defeat, but secrets threaten to tear everything apart.
In the thrilling conclusion to the Dark Dreamer trilogy, Nora and the Sandman must face old friends, dead enemies, and new betrayal if they're going to keep the Ever Safe shut. If they fail, both the Day and Night Worlds will descend into darkness.