Earth was threatened with attack from the huge space-fleets of the Hundred Suns of Andromeda

an attack that the Terran Fleet could not hope to defeat.

Only one chance remained to prevent Earth's destruction, and that was the chance that a skilled and experienced saboteur might just have time to strike his blow before the enemy could launch the attack.

It was Captain Blair whose mission this became, and it was his ace-saboteur who raced against death in planet after planet, as the zero-hour approached when Earth would face the attacking fleets of DARK ANDROMEDA.