While on a solo expedition on a yacht in the Indian Ocean, a resourceful sailor (Robert Redford) wakes to find his ship taking on water after a collision with a shipping container left adrift.
With his navigation equipment and radio disabled, he's suddenly thrown into the path of a violent storm. Having patched the breached hull, he survives the tempest, but just barely. With only a sextant and nautical maps to chart his progress, he has to hope currents will eventually take him into the path of a passing vessel. But as his meager supplies dwindle, he soon finds himself staring his mortality in the face.