A rising tide from the infernal threatens to engulf Boston. Just a harrowing competition into a realm of displaced magic can end it.

Kate Finch keeps her promises. Even when they pull her deeper into the colony’s power problems and politics intrigues. Even though they entangle her additional using the shadowy magic increasing in the woods and vales around Salem. But as August Swaine’s experiments grow more brash, Finch’s commitment faces to the best test. When keeping her most ill-advised guarantee uncovers the true level of her master’s folly, she faces a reckoning beyond any witchcraft, spells, or wards.

Finch promised herself she’d hardly ever lose another cherished one to a demon.

Is it the main one promise she has to break?