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| - The story opens with Nancy tending her prize delphiniums when a mysterious carrier pigeon lands in her yard, causing her to contact the registry for the birds. Meanwhile, housekeeper Hannah Gruen takes a fall and must be treated at the local orthopedist's office. The attending physician, Dr. Spires, later confides to Carson Drew and Nancy that he was forced to tend an elderly woman for her shoulder - the drivers of a car blindfolded him when they drove him there, so he wouldn't be able to guess her location, leading him to believe the patient was a prisoner. The only clue to her identity is a bracelet with a family crest, and the doctor's belief that she was being held on Larkspur Lane. Nancy, of course, immediately sets out to track the crest, discovering that it belongs to the Eldridge f
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| abstract
| - The story opens with Nancy tending her prize delphiniums when a mysterious carrier pigeon lands in her yard, causing her to contact the registry for the birds. Meanwhile, housekeeper Hannah Gruen takes a fall and must be treated at the local orthopedist's office. The attending physician, Dr. Spires, later confides to Carson Drew and Nancy that he was forced to tend an elderly woman for her shoulder - the drivers of a car blindfolded him when they drove him there, so he wouldn't be able to guess her location, leading him to believe the patient was a prisoner. The only clue to her identity is a bracelet with a family crest, and the doctor's belief that she was being held on Larkspur Lane. Nancy, of course, immediately sets out to track the crest, discovering that it belongs to the Eldridge family of St. Louis. In the meantime, the registry contacts Nancy about the pigeon, suspecting something criminal is involved. Effie Schneider, a foolish girl, is serving as Hannah's substitute, and gets in on the action when Nancy attempts to track the carrier pigeon's flight into the country. A strong woman attacks Nancy downtown, then steals the bracelet from her. Due to threats of intruders and increasing danger, the Drews accept Helen Corning's invitation to visit Sylvan Lake. Coincidentally, Nancy rescues a young Eldridge child from a mishap at the lake, and learns that an elderly relative is missing. Nancy and Helen explore the vicinity, finally finding "L.S. Lane." Near the little-used road is an estate surrounded by an electrified fence, and also surrounded by delphiniums. Elderly patients are outside on the grounds. Mrs. Eldridge is outside, near the fence, and reveals that she is indeed a prisoner. When involved in a struggle outside, Nancy is knocked-out after being thrown to the ground. When Nancy wakes up Bess warns her 'Nancy you were knocked-out yesterday, don't get into more trouble'. However, Nancy proceeds with the case. Nancy and Helen disguise themselves as an old lady and her nurse, and enter using the password, "singing horses." Nancy reaches Mrs. Eldridge, rescues her, and sends her safely away with Helen before being imprisoned by the evil doctor and his partners, who are kidnapping wealthy elderly people and forcing them to sign over money and securities. She escapes from her cistern prison and sabotages their getaway airplane, just as the police arrive.
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