Thea Knight loves a spot of mischief. She especially loves her current mischief: masquerading as her sister, while finalizing her scheme to expose the dastardly knaves whose lies ruined her life. Then big, bad-tempered Lord Luxborough upends her game by maneuvering her into marriage. But it's her sister’s name on the license, so the marriage won’t be valid. Thea’s idea? Keep pretending to be her sister until she can run away.

A handsome and reclusive horse breeder, Spencer Dumarque, the fourth Duke of Morland, is a member of the exclusive Stud Club, an organization so select it has only 10 members - yet membership is attainable to anyone with luck. And Spencer has plenty of it, along with an obsession with a prize horse, a dark secret, and, now, a reputation as the dashing "Duke of Midnight." Each evening he selects one lady for a breathtaking midnight waltz. But none of the women catch his interest, and nobody ever bests the duke - until Lady Amelia d'Orsay tries her luck.

The last thing Amelia Kennington wants is to participate in the London Season. But the daughter of a duke is not afforded such opinions. She must put forth a subdued facade, but beneath it is a well-hidden fire that surfaces only when provoked—such as when an overly familiar gentleman startles her and she falls into the Serpentine.

Shopgirl Poppy Fairchurch knows it's pointless fantasizing about the Duke of Autenberry. Still, dreams can't hurt anyone, unlike the carriage Poppy spies bearing down upon the unsuspecting duke. After she pulls him to safety, the duke lapses into a coma, and Poppy is mistaken for his fiancée. But one person isn't fooled: his arrogant and much too handsome half brother, Struan Mackenzie. Soon Poppy isn't sure what she wants more: the fantasy of her duke or the reality of one smoldering Scot who challenges her.

As the city prepares to celebrate Queen Victoria's golden jubilee, Veronica Speedwell is marking a milestone of her own. After burying her spinster aunt, the orphaned Veronica is free to resume her world travels in pursuit of scientific inquiry - and the occasional romantic dalliance. As familiar with hunting butterflies as she is fending off admirers, Veronica wields her butterfly net and a hatpin with equal aplomb, and with her last connection to England gone, she intends to embark upon the journey of a lifetime.