Donna Parker Special Agent by Marcia Martrin

First edition published 1957. The summer is over and it is time for Donna and Ricky to go back to Summerfield Junior High. Donna and Ricky go their separate ways more often as Ricky pursues her dramatic talents whilst Donna joins the school newspaper, quickly becoming elected as assistant editor. Things take a turn for the mysterious when her long-lost uncle appears in Summerfield, her friend, Tommy Sheridan, thinks he is being spied on, Donna's friends begin to ignore her, and a strange character, Mr Brown, is employed at Summerfield Junior High. Little does Donna realise that an exciting trip to New York City will reunite her with old friends and solve all of the mysteries.