Brock and Kathy are summoned to Cabot's, an honored stamp dealer, to investigate the kidnapping of the wife od Sammy Starling, an ex-crock from Brock's past, and the only clue to the crime lies in the unusual ransom notes, which are decorated with the valuable Chalon Head stamp of a young Queen Victoria, to whom the victim bears a striking resemblance. Reprint.
This book is part of the Brock and Kolla/Kathy and Brock Books series and is book #4 in the series.