After the Battle of Waterloo, Captain Stephen Killian of the Inniskilling Dragoons travels to war-weary Paris, where a typically reckless act of bravery makes the Duke of Wellington notice him. The Duke sends Stephen to Lord Forgall the Wily,  Wellington's spymaster. Can a fierce, outspoken warrior learn the subtle tradecraft of a spy?

Lord Forgall's most trusted assistant is his beautiful daughter Emma. Her grace and charm wins her the confidence of the rulers and diplomats who have gathered to carve up Napoleon's former empire. The last person she needs by her side is a hot-headed former cavalryman who is definitely not known for his self-control!

Loving a spy is dangerous business. Trusting a spy is foolhardy. But when a plot to upset the peace talks threatens to re-ignite the turmoil of war, can Killian and Emma join forces to catch the culprits?