Challenge Down Under: A Dave and Katie Adventure (Challenge Mystery-Destination Series)If Hallmark Mysteries joined the Travel Channel describes the Challenge Series. Dave and Katie Parker are a retirement aged couple recovering from difficult circumstances. I feel like our old life was a boat that went over a waterfall with us inside. Now were bobbing up in the pool below, glad to be alive, but without a boat, says Katie. The Challenge Series of novels follow the Parkers as they solve mysteries, thwart criminals, and find new