Vengeance — Shane Johnson

Vengeance is the final book in The Red Door trilogy. Kirsten is free from the ranch but is emotionally conflicted and confused. She follows her heart as it leads her down a path of unforeseen perils. Sid is a lone wolf once again. On leave from the agency, he takes some time to deal with his personal issues. He has promises to keep, loose ends to deal with, and a score to settle. He also may have a price on his head, from his own boss.