Rejected by the woman he deeply craves, the incomparable Miss Milborne, for his unsteadiness of character, the wild Viscount Sheringham is bent on avenging fate and coming into his fortune. Rebellious young Sherry cannot claim his inheritance until he marries, so he leaves his mother's house and, on a passionate impulse, vows to marry the next woman he sees. The very first woman he sees is his lifelong friend Hero Wantage, a young and charmingly unsophisticated girl. To orphaned, pixieish Hero, who has secretly loved him since childhood, it seems like a star-studded dream when dashing Lord Sheringham asks her to be his bride — for although she knows it is a marriage of convenience (his convenience), it eliminates the depressing prospect of life as a governess. It seems that this marriage might solve all their problems.
Back in London, Hero soon discovers the glamorous social scene and strives to make a name for herself among the right circles. But their marriage becomes a frenetic comedy of errors, as Hero tries to keep up with the fashionable and unfamiliar society in which she now finds herself. From chariot races to gambling tables to exclusive drawing rooms, an exasperated Sherry follows in his wife's wake, trying to clear the air after her well-intentioned but scatterbrained escapades. When Sherry intervenes, fearing she’ll embarrass them both, misunderstandings pile up, friendships are tested, and hearts are pushed to breaking point. To their great surprise, both Hero and Sherry discover that even a marriage of convenience can turn into a love affair under certain circumstances.