Patience Whitford spent the last two seasons watching her elder sisters make grand matches. She is thoroughly apprehensive with the notion of being limited by marriage. But that seems like an inconsequential concern with no prospects on the horizon to follow in her sisters' footsteps. And to make matters worse, she is uncommonly jealous of all of the military officers she's befriended and their grand adventures. When Major Ashley Stuart is assigned to investigate some petty crimes near his brother's estate in Greenwich, it soon becomes apparent that there is something much larger going on.

Lady Evangeline Raine prefers animals to people and has no interest in marriage—much to the dismay of her flirty younger sister, Viola. Because their father has one rule: Viola may be courted, only if Effie has a suitor as well. Saddled with debt, Gage Croft, Duke of Vale, is determined to rebuild his estates. When the owner of his vowels offers him a fortune to charm the impervious Lady Evangeline for the season so Lady Viola can be courted, the game is on, even if it means pretending to seduce an unconventional wallflower.

American heiress Emma Dunster has always been fun-loving and independent, with no wish to settle into marriage. She plans to enjoy her Season in London in more unconventional ways than husband hunting. But this time Emma's high jinks lead her into dangerous temptation. Alexander Ridgely, the Duke of Ashbourne, is a notorious rake who carefully avoids the risk of love until he plants one reckless kiss on the sensuous lips of this high-spirited innocent and condemns himself to delicious torment.

Lucy Bell burns with determination. Convinced an arrogant aristocrat is to blame for her expulsion from her beloved school, the penniless girl sets out to visit her best friend to help her undo the catastrophe. But when a storm on the road leaves her in a compromising position with a handsome gardener, she is swept away by his gruff kindness.

When faced with an unwanted marriage, Alice Rosemeyer accepts an invitation to the estate of Larkhall. Determined to earn her future security without a husband, she begins operating as the anonymous Ace of Hearts, writing letters and offering advice on behalf of the men eager to secure a match at the close of the London season. If she can manage to keep her identity secret, her reputation intact, and avoid the arrogant house guest, Mr. Thomas Herring, she might just call herself successful.