Forced to trade his valuable furs for a well-educated escaped slave, a rugged trapper vows to recover the pelts from the Indians and later the renegades that killed them.

Burt Lancaster plays a pirate with a taste for intrigue and acrobatics who involves himself in the goings on of a revolution in the Caribbean in the late 1700s. A light hearted adventure involving prison breaks, an oddball scientist, sailing ships, naval fights and tons of swordplay.