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Bonanza's twelfth season commenced on September 13, 1970 with the episode titled "The Night Virginia City Died." Several Virginia City buildings have burned to the ground; the townsfolk are in an uproar, and the local constabulary is apparently helpless. Meanwhile, the Cartwrights have befriended a pretty young stranger named Janie (Angel Tompkins), the new sweetheart of Deputy Clem (Bing Russell). Only the audience knows that the profoundly disturbed Janie is the elusive arsonist whom everyone is seeking. Written by John Hawkins, this episode was specially contrived to "destroy" the old Virginia City sets at the Paramount studios so that the Bonanza company could move into its new home at Warner Bros. "The Night Virginia City Died" also boasted a new Bonanza theme song by David Rose, which would endure until the old theme was brought back by popular demand in 1972.