The Firebrand

Adrianne Percy was hidden in the Western Isles, safe from her family's enemies - until her sisters sent a notorious pirate to return her to the Highlands. But when she hatches a plan to free her kidnapped mother, it requires her to marry the handsome rogue - and what begins as a simple matter of business quickly flares into an uncontrollable desire....As Adrianne's heart smolders, their calculated arrangement threatens to ignite into a burning passion...

This is #3 in Highland Treasure Trilogy.