Lieutenant Drebin discover that his ex-girlfriend's new beau is involved in a plot to kidnap a scientist who advocates solar energy.

Lt. Frank Drebbin return to save the day once again. This time he's out to foil the "big boys" in the energy business. A top scientist (Dr Mainheimer) is about to publish his report on energy supply for the future. Things don't look good for the traditional supplier; oil, coal and nuclear. To save their industries, the supplier kidnap Mainheimer and replace him with a decoy with a more favourable report. Jane, the Dr's secretary, is Drebbin's old flame; they're passionate love affair is thus rekindled.