Following their harrowing journey in Perils of Sea and Sky, Captain Rosanne Drackenheart is determined to discover the secrets of the map her father left behind. But the Veil has left its scars in Rosanne's heart, as she's still hurting from the choices she made while being courted by the Forest Devil himself.

Grappling with her guilt, she gathers her crew, including a disguised Aros Bernhart who seeks escape from the inquisition, and heads back into the inhospitable fog. The crew believes that since they had escaped the terrors of the magical mist before, they are better equipped this time to explore the islands within.

They couldn't be more wrong.

Beset by shape-shifting creatures able to infiltrate dreams, Rosanne is faced with an invisible adversary forcing her to confront her fragile mind. As their journey takes them to the very heart of the Veil, hybrid monsters stalk the Red Queen, and Rosanne must once again work together with Aros to see their journey through or be lost to the Grey Veil forever like so many before them.