The Password to Larkspur Lane delphiniums when a mysterious carrier pigeon lands in her yard. Nancy contacts the registry for the carrier pigeon. Meanwhile, housekeeper Hannah Gruen takes a fall and must be treated at the local orthopedist's office. Her attending physician, Dr. Spires, confides to Carson Drew and Nancy that he was forced to tend an elderly woman for her shoulder under peculiar circumstances: the driver of a car blindfolded him when they drove him there, so he wouldn't be able to guess her location, but the doctor believes their destination might have been someplace called Larkspur Lane. Events led him to believe the
Larkspur Downtown Historic District on the National Register of Historic Places in 1982. It was asserted that the district is significant because it still has the ambiance of a small California town in the 1900 - 1930 era. Larkspur Downtown Historic District Larkspur Downtown Historic District, known also as Old Downtown Larkspur, is a historic district along Magnolia Avenue in downtown Larkspur, Marin County, California. The district covers the "Old Downtown" area, along Magnolia Avenue from the Lark Creek Inn at 234 Magnolia Ave to the platform on the former railway, now a bicycle path. The avenue has been the commercial center of activity