May, 1591. When Queen Elizabeth decides to embark on a Royal Progress, visiting some of the grandest homes in England, her new spymaster, Sir Robert Cecil, sends Kit Marlowe on ahead, to ensure all goes smoothly. But Marlowe's reconnaissance mission is dogged by disaster: at Farnham Hall, a body is hurled from the battlements; at Cowdray Castle, a mock tournament ends in near tragedy; at Petworth, a body is discovered in the master bedroom, shot dead.

By the time he reaches Chichester, Marlowe fears the worst. Are the incidents linked? Is there a conspiracy to sabotage the Queen's Progress? Who is pulling the strings - and why? To uncover the truth, Marlowe must come up with a fiendishly clever plan.