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.

But Gage gets much more than he bargains for in an adversary who wants to make her own scandalous arrangement. Effie will go to London for the season, but only if Gage agrees to be her lover. Yet when their fake courtship leads to passionate feelings, will their indecent proposal end with the season or be the start of something real?