When the Age of Space Exploration Begun 2071, Humanity explored vast areas .It also landed on Many Life-Compatible Planets. The USMC (United States Marine Corps) and NASA together created Halos in the Distant Space acting as Vacation Paradises and Space Refueling Centres. By the year 2501 Planet Reach was explored and had the most Highest Life Compatibility. But In 2524, a race called as the Covenant attacked us. Now It is the year 2152, Reach has Fallen , the Covenant have landed at New Mombasa and are Searching for something. Something Deep inside the City.Something Mysterious. Will we be able to identify and Recover it Before the Covenant Capture it and it's too Late?