This book is a sequel to Twenty Thousand Leagues Under The Sea. A party of British adventurers, who had been ballooning, but whose trip had ended by being cast away on a Pacific island, have various setbacks due to both pirates and convicts who had escaped from jails in mainland Australasia. They realise that at times there appears to be some kind of entity that is looking after them.

This book is a sequel to Twenty Thousand Leagues Under The Sea. A party of British adventurers, who had been ballooning, but whose trip had ended by being cast away on a Pacific island, have various setbacks due to both pirates and convicts who had escaped from jails in mainland Australasia. They realise that at times there appears to be some kind of entity that is looking after them.