Foxing the Geese — Janet Woods

She is a spinster with a secret fortune ...
He is an impoverished earl who must marry money or face ruin ...
Theirs is a love match to be reckoned with

1812. Clever, strong-willed Vivienne Fox is unexpectedly endowed with riches beyond her wildest dreams when a remote cousin dies, leaving her his fortune. Unwed at twenty-four, Vivienne still hopes the right man is out there, but she despairs of ever finding him, and she is determined that rumors of her new-found wealth be quashed, lest she be courted for her purse rather than her heart.

Renowned rake Lord Alex LéSayres comes to an unpleasant decision after the death of his father. If he is to save their family lands, he must marry a wealthy woman -- and quickly. Introduced to Miss Fox, his interest is soon piqued. But he must set aside his rising feelings, or else his family will face disaster...