In this lyrical, wildly inventive horror novel interwoven with Japanese mythology, two people living centuries apart discover a door between their worlds.October, 2026: Lee Turner doesn’t remember how or why he killed his college roommate. The details are blurred and bloody. All he knows is he has to flee New York and go to the one place that might offer refuge—his father’s new home in Japan, a house hidden by sword ferns and wild ginger. But something is terribly wrong with the no animals will come near it, the bedroom window isn't always a window, and a woman with a sword appears in the yard when night falls.October, 1877: Sen is a young samurai in exile, hiding from the imperial soldiers in a house behind the sword ferns. A monster came home from war wearing her father’s face, but Sen would do anything to please him, even turn her sword on her own mother. She knows the soldiers will soon slaughter her whole family when she sees a terrible a young foreign man who appears outside her window.One of these people is a ghost, and one of these stories is a lie.Something is hiding beneath the house of sword ferns, and Lee and Sen will soon wish they never unburied it.

It all started out as a game. Just a way to have fun. We figured as long as we had rules, it wouldn't be a problem. RULE #1: Only break into one another's houses. RULE #2: Only take stuff that can be replaced. It worked for a while. Whoever's turn it was to break in got a rush, and the rest of us laughed over the trophies they brought back. But then someone went too far. Lives got ruined. Someone is dead. And I might be next.

It all started out as a game. Just a way to have fun. We figured as long as we had rules, it wouldn't be a problem. RULE #1: Only break into one another's houses. RULE #2: Only take stuff that can be replaced. It worked for a while. Whoever's turn it was to break in got a rush, and the rest of us laughed over the trophies they brought back. But then someone went too far. Lives got ruined. Someone is dead. And I might be next.

Welcome to the Gun Show! The top ten list is populated. The sponsorship program is open. The difficulty is ramping up. The first three floors were nothing compared to what Carl and Donut now face. The Iron Tangle. An impossibly-complicated subway system built out of the world's subterranean railway systems, all combined and then tied together into a knot. Up is down. Down is up. Close is far. The cars are filled with monsters, the railway stations are less than safe, and the exit is always just a few stops away. But there is hope. For the first time, the crawlers are all working together. The loot is better than ever. And the secret to unraveling it all may be hidden in the pages of a seemingly-useless book. Welcome, crawlers. Welcome to the fourth floor of the dungeon.