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October 2559. It has been a year since the renegade artificial intelligence Cortana issued a galaxy wide ultimatum, subjecting many worlds to martial law under the indomitable grip of her Forerunner weapons. Outside her view, the members of Blue Team-John-117, the Master Chief; Fred-104; Kelly-087; and Linda-058-are assigned from the UNSC Infinity to make a covert insertion onto the ravaged planet Reach. Their former home and training ground-and the site of humanity's most cataclysmic military defeat near the end of the Covenant War-Reach still hides myriad secrets after all these years. Blue Team's mission is to penetrate the rubble-filled depths of CASTLE Base and recover top-secret assets locked away in Dr. Catherine Halsey's abandoned laboratory-assets that may prove to be humanity's last hope against Cortana. But Reach has been invaded by a powerful and ruthless alien faction, who have their own reasons for being there. Establishing themselves as a vicious occupying force on the devastated planet, this enemy will soon transform Blue Team's simple retrieval operation into a full-blown crisis. And with the fate of the galaxy hanging in the balance, mission failure is not an option.
