A ghost haunts the long halls of Keyhouse - the spirit of Bode Locke, cast out of his body by the Demon named Dodge - and only one person can hear his voice: Bode's old playmate, Rufus Whedon. It's time to soldier up: the final battle for Keyhouse is about to begin.

Chapter Four - Human Sacrifices: The bottomless pit of the Drowning Cave threatens to become a mass grave, as Dodge springs a fatal trap on the senior class of Lovecraft Academy. Hope is as fragile as a candle-flame wavering in the night... and as easy to extinguish.

In the Drowning Cave, the black door is open at last, and for the kids trapped down there, the choice is simple: resist and die, or pass through the door and be lost forever. In the hole beneath Keyhouse the stones run with blood, the living shadows run riot, and time runs out... as Locke & Key enters its final chapters.