Jack and Annie travel to Vienna, Austria, in 1762 where they meet the young Wolfgang Amadeus Mozart and his sister and help save the budding genius' life.

"Lady Sophia Huntington Villiers is no stranger to intrigue, as her work with Alan Turing's Bombe Machines at Bletchley Park during the war attests. Her wartime marriage of convenience to Simon Barre, the eighth earl of Camden, granted her the independence she craved and saved his estate. Now, as part of his covert team in postwar Vienna, she uses her charm to uncover a lethal double agent immersed in the world of relics-including the long lost death...

When Mozart arrives at the court of Emperor Joseph II, court composer Antonio Salieri is horrified to discover that the godlike musical gifts he desires himself have been bestowed on a bawdy joker. Mad with envy, he plots to destroy Mozart by any means.

Enlisted by beautiful opera star Leigh Llewell to investigate her brother Oliver's mysterious death, SAS operative Ben Hope finds himself caught up in a centuries-old puzzle. The official line states that Oliver died while investigating Mozart's death, but the facts don't add up.