Dalton Brothers the promise

The Dalton brothers take up the challenge their parents left them to climb the tallest mountains of the world. The made a promise to their sister who died a year earlier to climb the seven summits of the world on all seven summits. They start in Alaska climbing Denali the tallest mountain in North America and then head south to travel form pole to pole to be the first brothers in history to do such a feat. They encounter a lifetime of adventure on their journey and run the risk of not making it back home alive.