The Charmer — Celeste Bradley

Collis Tremayne could make any female swoon; yet no one would guess the hidden desperation that drove him to become the most skilled spy in service to the Crown. All that stands in his way...is Rose Lacey, a confounding chit who manages to outsmart him with cunning and courage. She is the only woman he cannot melt with his smile. With every breath, he wishes he never laid eyes on her. And with every flash of her green eyes, he craves to possess her...

Rose Lacey fought hard to meet the challenge of becoming a spy for the infamous Liars Club. And if it weren't for Collis Tremayne, who manages to make her blood boil with his arrogance, and leave her breathless with white hot longing, she'd achieve her dream. Now, they must work together on a secret mission to uncover a dangerous plot -- one in which the very safety of England hangs in the balance. Armed with wit and wiles, they must face deadly intrigue, clever enemies, and -- if they can manage not to murder one another -- the intoxicating lure of unbidden passion...