Halo: Nightfall

When Agent Locke and his team are caught in a horrific biological attack on the colony world of Sedra, they must turn to an unlikely source to obtain key information about the incident.

Locke and Aiken lead their soldiers onto the ring fragment's surface, but encounter a deadly new threat.

Plans are set in motion to complete the mission at all costs, but will they survive long enough to see it through?

Deadly threats from the Hunter worms begin to unravel the soldiers' resolve and turn them against one another on a quest for survival.

To complete the mission, true soldiers will make the ultimate sacrifice, leaving only one thing: a race to escape and a will to survive.