Allie Quinn is not an explorer, and Jake O'Malley is definitely not her husband.

Allie would give anything to make her grandfather's lifelong dream come true. Decades ago, he discovered an ancient civilization, but an earthquake destroyed the evidence. Now, new clues hinting at a "red treasure" lead to a cave in nearby Hauser Mountain, and Allie is invited to be part of the expedition.

One big problem. The eccentric landowner only allows married couples to stay – and work – on her property, but Allie has no idea where to find a husband on short notice.

Museum security guard Jake has gotten close to the old man, who reminds him of his own grandfather. This expedition would be a boon for the museum, and it could validate his friend's discovery. On a whim, Jake volunteers to be Allie's husband, securing both their positions on the team.

Armed with a legitimate (but unfiled) marriage certificate, cheap rings, and good intentions, Allie and Jake embark on a treasure hunt with a small expert team (of married couples) leading the way.

They might find a chest of rubies and gold... or they might find a treasure no one could have expected.