Horror writer Travis Glasgow and his wife, Jodie, have bought their first house in Westlake, Maryland, just steps from Travis’s older brother’s home. Travis is buoyed by the thought of renewing his relationship with his estranged sibling and overcoming the darkness from his past. But the house has other plans for him. Travis is soon awakened by noises in the night and finds watery footprints in the basement that lead him to the nearby lake, which has a strange staircase emerging from its depths.

When Travis discovers that a former occupant of his house—a ten-year-old boy—drowned in the lake, he draws connections to his own childhood tragedy. As his brother and wife warn him to leave well enough alone, Travis is pulled into a dark obsession, following the house’s secrets to the floating staircase—and into the depths of madness . . .