Halo series. Standalone novels

The humans aboard the spaceship the Pillar of Autumn crash-land onto a mysterious ringworld, where they discover a secret weapon, the Halo construct, built to stop the force known as the Flood, as they battle the Covenant who worship the Halo.

While soldiers fend off thousands of Covenant attacks, Section Three devises a plan using planet Onyx as a base, but when Halo is destroyed and Ancient Forerunner technology stirs, the Covenant race to claim it to change the course of the Human-Covenant War.

In the first, desperate days of the Human-Covenant War, the UNSC has enacted the Cole Protocol to safeguard Earth and its Inner Colonies from discovery by a merciless alien foe. When the Prophets send their best---an ambitious and ruthless Elite--to destroy the the Outer Colonies and acquire the location of Earth, a three-man renegade squad led by Navy Lieutenant Jacob Keyes fights to hold together a shaky alliance between human survivors and the...

A tale set in the universe of the best-selling game follows the experiences of maverick detective Veta Lopis of the Gao Ministry of Protection, who would capture a serial murderer and prevent full-scale war between the military and insurrection loyalists.

"2526. It has been more than a year since humanity first encountered the hostile military alliance of alien races known as the Covenant, and several weeks after the United Nations Space Command's devastating counterattack of Operation: SILENT STORM was deemed an overwhelming success. The UNSC has put its faith in the hands of the Spartans, led by the legendary Master Chief, John-117: enhanced super-soldiers raised and trained from childhood via a...

"An original full-length novel set in the Halo universe and based on the New York Times bestselling video game series! It has been six years since the end of the Covenant War...and yet on the planet Carrow, a world on the edge of the Joint Occupation Zone, a decisive new battle suddenly erupts. Human colonists and the alien Sangheili have already been living a tension-filled co-existence in this place, with Unified Earth Government envoy Melody Azikiwe...

"October 2559. With the galaxy in the suffocating grip of a renegade artificial intelligence, another perilous threat has quietly emerged in the shadows: the Keepers of the One Freedom, a fanatical and merciless Covenant splinter group, has made its way beyond the borders of the galaxy to an ancient Forerunner installation known as the Ark. Led by an infamous Brute named Castor, the Keepers intend to achieve what the Covenant, in all its might, failed...

"December 2559. Humanity has its back against the wall after the United Nations Space Command flagship Infinity drops out of slipspace into a devastating ambush launched by the Banished. As this fierce enemy alliance seeks to claim a mysterious object hidden within the ancient Forerunner construct known as Zeta Halo, the surviving UNSC corps finds itself compromised and its leadership out of reach--with remaining personnel forced to abandon ship and...