Fortune’s Flower by Anthea Lawson

Miss Lily Strathmore has made a desperate bargain. One last adventure abroad with her botanist uncle and his family, and then she will do as her parents bid and wed the proper (and boring) viscount her mother has selected as Lily’s ideal husband.

Publisher Description

James Huntington is on a mission. Retrieve his grandfather’s lost journals from the wilds of Tunisia, and win the estate and fortune he so desperately needs. This quest will be the making of him – or his ruin.

Thrown together on a botanical expedition, James and Lily’s attraction is immediate, and impossible. Despite every reason to keep their distance, the two find themselves inexorably drawn together as they race to reach a hidden valley before their enemies can bring all their dreams crashing down.