England 1952: King George VI's sudden death has created a crisis.
As the royal jewelers prepare for the coronation of Queen Elizabeth II, they discover that the historic jewels in the Imperial State Crown have been replaced with fake stones.
The real jewels had been removed from the crown at the beginning of World War II, to preserve them in case of invasion, but they are no longer in their hiding place.
Where are they now? Only one man knows but he has disappeared.
Powerful forces are plotting to block Elizabeth's coronation and replace her with another member of the royal family. They will stop at nothing to retrieve the jewels for their own purposes.
With time running out, a small group loyal to Elizabeth, must follow a trail of treachery and death.
They must unravel the mystery on the night a squad of conscientious objectors were sent to dig a hole in the grounds of Windsor Castle and hide Britain's greatest treasures...in an old biscuit tin.
