When escaped convicts commandeer The Rattler and hold a man captive, the only thing preventing them from sailing out is a pair of ancient cannons.

Captain Grief arrives at the port of Rapa-Nui only to find it has been taken over by smugglers, who hold the governor and his daughter hostage.

When uncut gems are found on her island plantation, Madame Gideaux and her daughter are held hostage by murderous thieves.

A noted scientist falls for a beautiful native girl and becomes a derelict as a result.

The arrogant son of a plantation owner visits the Solomon Islands, where his sister and Captain Grief have staged a native uprising to scare him away.