Lord and Lady Spy series

No man can outsmart him, but she's been outsmarting him for years

Lord Adrian Smythe may appear a perfectly boring gentleman, but he leads a thrilling life as one of England's most preeminent spies, an identity so clandestine even his wife is unaware of it. But he isn't the only one with secrets.

Now that the Napoleonic wars have come to an end, daring secret agent Lady Sophia Smythe can hardly bear the thought of returning

...

Jane Bonde was raised to be a spy, but the ton knows her only as an elusive beauty who turns men's heads when she walks into a room. She's also the Crown's last best hope. If she can't find and destroy the diabolical Fonćé and his French spy ring, England's defenses may fall. But something even more dangerous than a madman stands in her way-- her fiancé.