1310, Berwick-upon-Tweed, England. Edward II knights Frederick Kohl for his bravery fighting the Scots. But Sir Frederick is not the man the king believes him to be; instead, it is his sister, Christina, who assumes her dead brother's identity and receives his spurs.

Still posing as Frederick, Christina escorts Lady Cecily, a young noblewoman joining Queen Isabella's court at Westminster Palace, to London. Unexpectedly, Christina and Cecily fall in love. Their joy is short-lived, as their future together is seemingly impossible.

The wife of one of the wealthiest and most influential men in the city is Christina's bitter enemy. Katharine Volker, whose lascivious advances Christina rejects, goads her into voyaging from her London home to the Baltic waters of her birthplace. Christina journeys not to engage in trade, as one would expect of a master merchant. She sails for a far more deadly purpose --- to exact revenge on the pirates who killed her father and brother.

What will transpire in London during her absence, and is there any hope for her lasting happiness with Cecily?

Christina must employ all her courage and fighting skill, as well as a secret weapon, to survive her adventure quest through pirate infested waters.