The Uninvited

1777: In the throes of the Revolutionary War, Landon Mansion is commandeered by British Lord "Butcher" Bedford. He stabs Lucy Tarleton—who spurned his king and his love—leaving her to die in her father's arms.

NOW: After the day's final tour, docent Allison Leigh makes her rounds while locking up…and finds a colleague slumped over Bedford's desk, impaled on his own replica bayonet.

Resident ghosts may be the stock-in-trade of stately Philadelphia homes, but Allison—a…