Halo 4 Forward Unto Dawn
For generations, humans traveled the stars and worked together to settle worlds under the banner of the United Nations Space Command. Peace is now shattered by insurrectionists causing a galaxy-spanning war. Cadet Thomas Lasky and his fellow students at Corbulo military academy now train to make this war their future. But Lasky is conflicted about his path, and his resolve is tested when the academy comes under attack from a terrifying alien assault.

Halo Nightfall
Set between the events of Halo 4 and Halo 5: Guardians… Halo: Nightfall tells the dramatic story of legendary man hunter and Naval Intelligence Officer Jameson Locke and his team as they are caught in a horrific biological attack while investigating terrorist activity on the distant colony world of Sedra. As they unravel a plot that draws them to an ancient, hellish artifact, they will be forced to fight for their survival, question everything and ultimately choose between their loyalty and their lives.