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Spring, 1648. When Thomas Hill, a bookseller living in rural Hampshire, publishes a political pamphlet he has little idea of the trouble that will follow. When news of the king's execution reaches the island, political stability is threatened and a fleet commanded by Sir George Ayscue arrives to take control of the island for Cromwell.

Aware of Thomas's background as a mathematician and his expertise in codes and ciphers, the king has summoned him to his court in Oxford. On arrival, Thomas soon discovers that nothing at court is straightforward.

The mood in London is one of relief and hope for a better future. But when two respectable gentlemen are found in a foul lane with their throats cut, it becomes apparent that England's enemies are using the newly re-established post office for their own ends.