They jumped into hell to save a part of heaven.

A seaplane lands on the island of Talua to unload three criminals-including Harry (Frank Sinatra) plus a young priest, Father Perreau (Kerwin Mathews), who has come to succeed aging, irascible Father Doonan (Spencer Tracy). When an earthquake and volcanic eruption strike Talua, Father Doonan persuades Harry to parachute with him into the mountains on a daring rescue to an isolated hospital. The party-mostly children - is menaced by landslides, forest fires, flowing lava and the near - collapse of a footbridge as they make their perilous way to safety. Tracy and Sinatra are in peak form as the unlikely heroes of this suspense-filled adventure.