Will Deadmarsh needs money. Badly. When a shadowy sleep study promises cash for participants with seizure disorders, he signs up, no questions asked. But the moment they wire him to the device, something changes. His deād sister starts showing up, and the line between logic, memory, and reality begins to decay.

Across town, Atra Hart doesn’t legally exist. She escaped the psychiatric hospital that raised her, only to discover the monster in her head never left. She thought the past was behind her but something survived, and it’s looking for her.

When their paths violently cross, Will and Atra are forced into a reluctant alliance neither wants. But something is hunting them both—something old, inhuman, and hungry.

They don’t trust each other. They don’t have a home. But they might be the only ones who can stop what’s trying to break through.