Unable to find work after a past felony, graduate John Wisdom and his girlfriend embark on a cross-country bank-robbing spree in order to aid American farmers.

Colonel Franz Ritter, a former hero pilot now working for military intelligence, is assigned to the great Hindenburg airship as its chief of security. As he races against the clock to uncover a possible saboteur aboard the doomed zeppelin he finds that any of the passengers and crew could be the culprit.

Engineer Jake Holman arrives aboard the gunboat USS San Pablo, assigned to patrol a tributary of the Yangtze in the middle of exploited and revolution-torn 1926 China. His iconoclasm and cynical nature soon clash with the 'rice-bowl' system which runs the ship and the uneasy symbiosis between Chinese and foreigner on the river. Hostility towards the gunboat's presence reaches a climax when the boat must crash through a river-boom and rescue missionaries upriver at China Light Mission.