The Elizabethan navy has a secret weapon: an optical instrument so powerful it gives England unassailable superiority at sea. Spain will stop at nothing to steal it and seize the men who understand its secrets - its operative known as 'Mr Eye' and its inventor, the mercurial Dr Dee.
When a second Armada threatens, intelligencer John Shakespeare is sent north to protect Dr Dee. While there he stumbles on an even greater danger: a plot that points to treachery at the very heart of Elizabeth's court. But Shakespeare faces serious accusations far closer to home...
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