The Mystery Pack with stamps, story and special lens which reveals a hidden image.
The New Sherlock Holmes Stamp Issue and Mystery Pack. Can you solve the mystery before the great detective?
Are you a budding detective?
With the new stamp issue from Guernsey Post you have the chance to follow in the footsteps of the world's greatest detective in a new adventure on the island of Alderney.
By reading the story, studying the pictures and stamps for clues you can crack the code and beat Holmes to work out whodunnit?