The Virginian S02 E26 The Secret of Brynmar Hall

"With every hoofbeat, history is made."

Betsy Garth is driven by Randy to Brynmar Hall, a large mansion, where she meets several other old acquaintances and invitees (Brooke Bundy, Tom Skerritt, Mark Goddard). All knew Mildred Brynmar, a young woman who was killed in a fire two years before, and have been invited to the house by Mildred's mother (Jane Wyman). A masked figure spies on the proceedings and several mysterious events occur which culminate in death.