Georgian Series by Julia Ross

It was the worst day of his life. Alden Granville, Viscount Gracechurch, bet everything he owned in a card game—and lost. Miserably. His investments...gone. His beautiful ancestral estate...gone. His jewels, his weapons...all gone. His only hope is to accept his opponents' final, fateful wager: he must bed the mysterious Mistress Juliet Seton—otherwise he is well and truly ruined. Past experience has taught Juliet that romance inevitably leads to disaster... moreIt was the worst day of his life. Alden Granville, Viscount Gracechurch, bet everything he owned in a card game—and lost. Miserably. His investments...gone. His beautiful ancestral estate...gone. His jewels, his weapons...all gone. His only hope is to accept his opponents' final, fateful wager: he must bed the mysterious Mistress Juliet Seton—otherwise he is well and truly ruined. Past experience has taught Juliet that romance inevitably leads to disaster. But when Viscount Gracechurch turns up in her garden—and is promptly felled by a bee sting—she can't bring herself to send him away. The sky rumbles. Darkness descends. He challenges her to a game of chess—and thus a weeklong seduction begins. less

It was the last thing he expected...to catch a beautiful intruder disguised as a man, rummaging through his bedroom. The fair lady claimed she was stealing one of his cravats for a wager, but Robert Sinclair Dovenby—known throughout fashionable London as Dove—suspects there is far more to "George" than meets the eye. Little does Dove imagine, however, that Sylvie Georgiana, Countess of Montevrain, is an agent hired to determine whether he's guilty of treason... moreIt was the last thing he expected...to catch a beautiful intruder disguised as a man, rummaging through his bedroom. The fair lady claimed she was stealing one of his cravats for a wager, but Robert Sinclair Dovenby—known throughout fashionable London as Dove—suspects there is far more to "George" than meets the eye. Little does Dove imagine, however, that Sylvie Georgiana, Countess of Montevrain, is an agent hired to determine whether he's guilty of treason. To uncover his well-guarded secrets, Sylvie finds herself having to stay dangerously close to her mischievous adversary. But when the masquerade comes undone, will she be able to betray the one man she thinks she could love? less