A new type of propulsion engine developed by engineers on the planet Sirius Delta had just undergone successful ground testing and was left overnight outside the testing laboratory. The morning after testing the engineers discovered that the engine was missing and contacted the Interstellar Police on Rigel Delta to request support to track down the engine. Commodore Willis, senior police officer head of Rigel Delta police, assigned CDI Skyward and DS Smith of the special police to investigate the theft. Wearing their special armour, CDI Skyward and DS Smith start their investigation and travel to the laboratory on Sirius Delta a planet in the Canis Major constellation, using the power lanes.