Linda Carlton's Perilous Summer

Linda Carlton and Aunt Emily vacation at Green Falls, Michigan with the usual crowd.  Linda and her friend, Dot Crowley, take a pleasure jaunt in Linda's autogiro over Lake Michigan to Wisconsin.  During the trip, the girls witness a hit and run accident, in which a girl is struck by a car and thrown into a ditch, unconscious.  The girls land and take the girl to a hospital.


The girl has amnesia as a result of the accident, so Linda and Dot take her back to Green Falls.  The girls name the victim Amy Johnson, after the famous aviatrix.  "Amy" appears to be cultured and educated, yet she does not know what many common words, such as radio, tennis, and movies, mean.  Linda is mystified about the girl's background.


Soon, an unfriendly woman arrives claiming to be Amy's aunt.  Linda does not trust her, and Amy is certain that she has never seen the woman before. Finally, the woman gains custody of Amy, and too late, Linda realizes that the woman is perpetrating a hoax.  Can Linda save Amy before it is too late?