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 radio system Range sets was restricted to the Royal Armoured Corps and the Royal Artillery, reflecting the fact that these formed the "teeth" elements likely to be involved in meeting any perceived threat of a Soviet advance across northern Europe. In 1962 a project to re-equip the remainder of the army was undertaken and given the name Larkspur, the name officially becoming retrospectively applied to the original New Range sets and eventually by common use becoming a technically incorrect generic label for virtually any radio equipment used by the British Army between the end of WWII and the arrival of the Clansman