Young pilot Jer Bren delivers valuable cargo to an abandoned scientific base in the Jupiter system. An ordinary flight turns into a series of incredible adventures and difficult trials. Jer needs to save the Martian princess from her enemies, and a huge asteroid is approaching planet Earth at breakneck speed... Relying only on his own strength and on the advice of a malicious cybernavigator, Courier-619 takes a risk. After all, the future depends on us! You need to fight and search, find and not give up!