A young boy and his family move into a house with a dark history tied to the Underground Railroad, only to discover that the past is not as buried as they believed. Thomas Small, a young boy moving to Ohio with his family, finds himself at the center of a mystery involving the former owner of their new home, an abolitionist named Dies Drear. As Thomas navigates the strange occurrences and hidden passages within the house, he must confront both the physical dangers of the property and the lingering secrets of those who seek to protect its history. The narrative follows Thomas's perspective as he attempts to decipher the clues left behind by the house's previous inhabitants while facing opposition from those who want the secrets to remain hidden.

Readers frequently highlight the effective atmosphere created by the author, noting how the house itself functions as a central character in the mystery. Discussion often centers on the balance between the historical context of the Underground Railroad and the immediate suspense of the plot. Critics appreciate the focus on the protagonist's curiosity and his methodical approach to uncovering the truth. The pacing is often described as steady, allowing for a gradual reveal of secrets that keeps the reader engaged throughout the narrative. Many readers find the integration of historical elements into a contemporary mystery setting to be a notable strength of the work.