Betrayal has many guises...

London, 1593: Five years on from the Armada and England is taking its first faltering steps towards a future as a global power. Nicholas Shelby - reluctant spy and maverick physician - and his companion Bianca Merton are settling into a life on Bankside. But in London there is always a plot afoot...

Robert Cecil, the Queen's spymaster, once again recruits Nicholas to embark on a dangerous undercover mission that will take him to the back alleys of Marrakech in search of a missing informer. However, while Nicholas hunts for the truth across the seas, plague returns once more to London - ravaging the streets and threatening those dearest to him.

Can Bianca and Nicholas' budding relationship weather the threats of pestilence and conspiracy? And will Nicholas survive the dangers of his mission in a hostile city to return safely home?