There are 3 books in the Halo: A Master Chief Story series. The newest book is Shadows of Reach which came out in 2020.

1
Silent Storm

Book cover of Silent Storm
2526. It has been a year since humanity engaged in its destructive first contact with a theocratic military alliance of alien races known as the Covenant. Now the hostilities have led to open war, and the United Nations Space Command understands virtually nothing about its new enemy. There are only…
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2
Oblivion

Book cover of Oblivion
A Master Chief story and original full-length novel set in the Halo universe-based on the New York Times bestselling video game series!

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…

3
Shadows of Reach

Book cover of Shadows of Reach
USA TODAY BESTSELLER

A Master Chief story and original full-length novel set in the Halo universe—based on the New York Times bestselling video game series!

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…