The Secret Signal

When a supply ship docks with Space Station Oberon, there's no hint of the crew's devious plans for the station's inhabitants.
Hal Junior realises something is up, but he's got a reputation as a troublemaker and the adults won't listen to him.
Can he defeat the bad guys with only his best mate, Stephen 'Stinky' Binn, to help?
Or is the Space Station doomed?