“Their duty record?” Dr. Halsey asked.

“Substandard,” Cortana replied. “They are slow and ineffective in offensive combat. They are somewhat of a joke within the fleet.”

“Perfect,” Dr. Halsey said. “I concur with your final selection recommendation. We will start the refit operations at once.”

“All we need now,” Cortana said, “is a Captain and crew.”

“Ah yes, the Captain.” Dr. Halsey slid on her glasses. “I have the perfect man for the job. He’s a tactical genius. I’ll forward you his CSV, and you can see for yourself.” She transferred the file to Cortana.

Cortana smiled, but it quickly faded. “His maneuvers at Sigma Octanus Four were performed without an onboard AI?”

“His ship left dock without an AI for technical reasons. I believe he has no compunctions about working with computers. In fact, it was one of the first refit requests he put in for the Iroquois.”

Cortana did not look convinced.

“Besides, he has the most important qualification for this job,” Dr. Halsey said. “The man can keep a secret.”

0800 Hours, August 27, 2552 (Military Calendar)

Epsilon Eridani System, FLEETCOM Military Complex, planet Reach

This was the third time John had been in this highly secure briefing room on Reach. The amphitheater had an aura of secrecy, as if matters of grave importance had regularly been discussed within its circular wall. Certainly, every time he had been here, his life had changed.

His first time was his indoctrination into the Spartans—a lifetime ago. He recalled with a start how young Dr. Halsey had looked then. The second time was when he graduated from the Spartan program, when he had last seen Chief Mendez. He had sat on the bench next to him—where the Chief was sitting now.

And today? He had a feeling that everything was about to change all over again.

Clustered around him were two dozen Spartans: Fred, Linda, Joshua, James, and many others he had not spoken to for years; constant battle had kept the tight-knit Spartans light-years apart for more than a decade. Dr. Halsey and Captain Keyes entered the chamber.

The Spartans stood at attention and saluted. Keyes returned their salute. “At ease,” he said. He escorted Dr. Halsey to the center stage. He sat while she stood at the podium.

“Good evening, Spartans,” she said. “Please take your seats.”

As one, they sat down.

“Assembled here tonight,” she said, “are all surviving Spartans save three, who are otherwise engaged on fields of combat too distant to be easily recalled. In the last decade of combat there have only been three KIAs and one Spartan too wounded to continue active duty. You are to be commended for having the best operational record of any unit in the fleet.” She paused to look at them. “It is very good to see you all again.”

She slipped on her glasses. “Admiral Stanforth has asked me to brief you on the upcoming mission. Due to its complexity and unusual nature, please disregard your normal protocol and ask any questions you have during my presentation. Now, on to the business at hand: the Covenant.”

Holographic projectors overhead warmed and sleek Covenant corvettes, frigates, and destroyers appeared in a neat row on Dr. Halsey’s left. On her right were a collection of Covenant species, roughly one-third their normal size. There was a Grunt, a Jackal, the floating, tentacled creature John had seen on Sigma Octanus IV, as well as the heavily armored behemoths he and his team had bested.

A spike of adrenaline burned through the Master Chief at the sight of the enemy. Intellectually, he knew that the images were not real... but after a decade of fighting, his instincts were to kill first and get the details later.

“The Covenant are still largely unknown to us,” Dr. Halsey began. “Their motivations and thought processes remain a mystery—though our best analysis points to some compelling hypotheses.”

She paused, and added, “The following information is, naturally, classified.

“We know that the Covenant—our translation of their name for themselves—are a conglomerate of a number of different alien species. We believe that they exist in some kind of caste structure, though to date the exact nature of that structure remains unknown. Our best guess is that the Covenant conquer and ‘absorb’ a species, and adapt its strengths into their own.

“The Covenant’s science is imitative rather then innovative, a by-product of this societal ‘absorption,’ ” Dr. Halsey continued. “This is not to say that they are lacking intelligence, however. During our first encounter they gathered computer and network components from our destroyed ships... and they learned at an astonishing pace.

“By the time Admiral Cole’s fleet arrived at Harvest, the Covenant initiated a communications link and attempted a primitive software infiltration of our ship AIs. In a matter of weeks, they had learned the rudiments of our computer systems and our language. Our own attempts to decipher Covenant computer systems have only been partially successful, despite our best efforts and decades of time.

“Since then they have made increasingly successful forays into our computer networks. That is why the Cole Protocol is so important and carries the punishment of treason for failure to comply. The Covenant may one day not need to capture a ship to steal the information within its navigational databanks.”

The Master Chief stole a glance at Captain Keyes. The Captain cupped an antique pipe in one hand; the Navy officer puffed on it once, and stared thoughtfully at Dr. Halsey and the examples of the Covenant vessels. He slowly shook his head.

“As I stated earlier,” Dr. Halsey continued, “the Covenant are a collection of genetically distinct groups in what we believe is a rigid caste system.” She waved toward the Grunts and Jackals. “These are most likely part of their military or warrior caste—not the highest ranking caste, either, given how many are sacrificed during ground operations. We believe there is a ‘race’ of field commanders, which we are currently calling ‘Elites.’ ”

She stepped toward the floating, tentacular aliens. “We believe these are their scientists.” As she moved closer, the figure animated; the image showed the creature disassembling an electric car of human manufacture. John instantly recognized his own battlefield recording.

She pointed to the giant armored creatures. “This was recorded on Sigma Octanus Four. A heavily armored warrior superior to either Grunts or Jackals.” The massive aliens also sprang into motion, lumbering into combat, until Dr. Halsey froze the images in place.

She turned and strolled back to the podium. “ONI hypothesizes at least two additional castes. A warrior capable of commanding ground forces and possibly piloting their ships, and a leadership caste. We have deciphered a handful of Covenant transmissions that refer to—” She paused, checking notes on the data screen in her glasses. “—Ah, yes. ‘Prophets.’ We believe that these Prophets are in fact the leadership caste, and that they are viewed by the Covenant rank and file with an almost religious reverence.”

Dr. Halsey removed her glasses. “This is where you come in. Your mission will involve these so-called Prophets, and will be executed in four phases.

“Phase one. You will engage the Covenant and sufficiently disable, but not destroy, one of their ships.” She turned to face Captain Keyes. “I leave that in the capable hands of Captain Keyes and his newly refitted ship, the Pillar of Autumn.”

Captain Keyes acknowledged her compliment with a curt nod. He tapped the stem of his pipe on his lips thoughtfully.

The Master Chief was unaware of any Covenant ship ever being captured. He had read the reports of Captain Keyes’ actions at Sigma Octanus IV... and considered the odds of actually capturing a Covenant vessel. Even for a Spartan, it would be a difficult mission.