When Master Chief first sets foot on the unknown ringworld known as Halo, he is fighting for his life. Harried and ambushed by countless enemy ships, Chief’s commanding officer scuttles their intergalactic craft upon the ringworld – assuming the human troops will fare better on this structure than face a cold, indifferent death in the vacuum of space. But once they set foot upon Halo, they realise all is not what it seems; here, they are trespassing on the work…