England, 1586. Treason threatens the very heart of the nation.

England is awash with traitors plotting to assassinate Queen Elizabeth I and bring about a foreign invasion.

Young physician Christoval Alvarez, a refugee from the horrors of the Portuguese Inquisition, is coerced into becoming a code-breaker and agent in Sir Francis Walsingham’s secret service at the behest of the Crown.

In the race to thwart the plot, who will triumph – the ruthless conspirators or the equally ruthless State?

An enthralling historical mystery with an exceptional twist, perfect for fans of S. J. Parris, D. V. Bishop and C. J. Sansom.