Elizabeth Boyce - Once a Duchess (Once A... #1)

Isabelle Lockwood was a duchess, until her husband of only a few months wrongfully divorced her for adultery. Since then she's been a pariah, living in anonymous exile to escape the prying eyes and wagging tongues of the town. More than anything, Isabelle longs for a family of her own, and so has to marry again. But society is ruthlessly unforgiving. To clear her name, Isabelle must face down her past - and the man who broke her heart and ruined her completely.

Marshall Lockwood, Duke of Monthwaite, was blindsided by his young bride's infidelity. After the divorce Marshall licked his wounds, throwing himself into his botanical studies to forget his disastrous marriage. Now his former wife is back in Town, as beautiful and enticing as he remembers. As the Season throws them together again, Marshall can't shake the feeling that Isabelle might not be the adulteress he took her for.