The House of Dies Drear (Dies Drear Chronicles, Bk. 1)

The house held secrets, Thomas knew, even before he first saw it looming gray and massive on its ledge of rock. It had a century-old legend -- two fugitive slaves had been killed by bounty hunters after leaving its passageways, and Dies Drear himself, the abolitionist who had made the house into a station on the Underground Railroad, had been murdered there. The ghosts of the three were said to walk its rooms....