Set in "Plata" County. Durango Colorado is the county seat of La Plata County, and the southern terminus of the Durango-Silverton Narrow Gauge Railroad. The Grand Imperial Hotel is in Silverton.
Guest stars Phyllis Thaxter, Robert Pine, and Pamela Franklin would appear together again two years later in an episode of Barnaby Jones (another Quinn Martin production) called Murder Once Removed (1975).