Nolan and Lila, the most stubborn pair at Mustang River Resort, are thrown together to design a grueling new trek for the resort's most adventurous guests.
They have to map the route, organize the supplies, and ride every mile of it, which would be easier if they did not already wear on each other's last nerve.
Nolan is a blunt, hard-drinking mountain man who wants strong whiskey and simple arrangements, while Lila is just as sharp-tongued and hard-drinking, content to carve wood in solitude and ignore her older brother's best friend.
Any pull between them is supposed to stay off-limits, because Nolan will not touch the sister he assumes has never been with a man.
Long days on horseback slide into longer nights under the stars, and irritation turns into a secret, heated affair that only seems to work inside the tent.
Neither of them grew up knowing safety, and with neglect and disappointment still marking them both, Lila's deepening feelings make her want to run even as Nolan refuses to be the next person who fails her.