Hey, Colin Again. If the 3rd novel for the halo series has anything to do with Halo 2, then it is going to be awsome. First, master chief and a small crew of marine survivors from halo hijack a Covenant Flagship, Cortana advances the plasma turrets and SlipStream Jumps, and eventually run into a covenant armada; at least 5 hundred ships.
But, before that, MC and his crew return to the destroyed reach in hopes of findin other Spatans, and they do, along with a woman named Dr. Halsley, the creator of the Spartan II project who has found a Forrunner Artifact that bends space, and the covenent are after it, too.
They also dock with a human ship, the Gettysburgh(note-this may be the ship MC is on in the Halo 2 announcment on the new halo disc).
Shortly after, they board a covenant station named the Unyieleding Hyrophent. MC and the rest of the spartans rig the station to blow, but before that, a captain lures the covenant ships to the failing station with a fake artifact and BOOM, the armada is destroyed, but the covenent still finds earth