As Kay Tracey walks into the flower shop, a smiling young stranger hails her with, "Hello there. Grand party last night, wasn't it?" Kay has never seen him before! Neither does she know any of several other people who greet her that morning as an old friend. Mistaken identity? More than that! Double trouble!

This time Kay is in collision with a deep and intriguing mystery which threatens to land her in a tight spot. Even Betty and Wilma, the Worth twins, cannot uncover the slightest hint as to who looks so much like their best friend. When Kay finally picks up the faint thread of a clue, it leads to the sunken garden of an old mansion where a ghostly figure wheels and pirouettes in the dim light.

How Brantwood's teen-age detective extricates herself in this exciting case provides an unforgettable story of courage, adventure and mystery.