When a party of Canadian miners get trapped after a cave-in, their air begins to run out. Somewhere in the Northwest United States, a trucker and his mechanic partner/brother find themselves down-on-their-luck, and sign up for the rescue mission, a not-so-great-big-convoy carrying needed rescue equipment across a frozen lake ... in April. Even in Canada, that's a risky way to go, but it's the mission they've signed up for.
The perils of nature and the underhanded designs of man increase their danger every mile.
