Bright Futures Development has announced the invention of a powerful new solar energy cell, and the Hardy boys have gone undercover to protect it from industrial spies. But the action proves too hot to handle: a company employee assigned to the solar cell lab has turned up dead!

Was it an inside job? or was it a rival company out to burn the competition? Frank and Joe follow a trail of deceit and double-dealing and discover that the truth behind the solar power source is much darker than they suspected. Plenty of high-energy action awaits them as they fly straight into a fiery web of danger!