The Carswell Adventure Series

A treasure hunter goes missing in the Yucatan jungle. Her inexperienced city-girl twin rushes to the rescue. What could go wrong? 

Norway is the land of Vikings and myths, and deep in a fjord, a sunken Nazi plane filled with gold. Which is exactly the kind of adventure Abby Carswell and Hermann Weiss relish undertaking. Enough so to make them push aside their misgivings about their enigmatic new business partner.