Kathryn Broch is basking in the first true happiness she's ever known.

The spiritual chaos of the outcaster's everyday life quiets long enough for her to plan her wedding and look forward to her life at Evan MacTavish's side. After sharing a devastating loss in the spring, the couple are stronger than ever and believe they can weather anything the future holds.

At their beloved cabin, Kath and her brother, Kellan, enjoy the end of summer with their friends while the last of the nuptial plans come together. The warm days are long, but the nights lift the veil in the forest allowing ancient entities to roam. The oldest of these beings are the elementals. Born of the land itself, they are energy feeders that cannot be destroyed or relocated, only temporarily distracted from an intended victim.

When a monster that has terrorized locals for centuries returns, the six learn an astonishing truth that leads them into unfamiliar waters. Their collective strengths and skills help them find a solution—but is the problem really solved?

Kath and Evan go joyfully into married life, but they are never free from their one irrefutable truth: the dark in Mount Iolite is different.