Taking place between the events of Halo 4 and Halo 5: Guardians, Halo: Nightfall follows the origin story of legendary manhunter Jameson Locke and his team as they are caught in a horrific terrorist attack while investigating terrorist activity on the distant colony world of Sedra.
Follows the exploits of Paul Serene and Martin Hatch of Monarch Solutions as well as three Monarch employees (Liam Burke, Charlie Wincott and Fiona Miller) as they fight to prevent or survive the approaching End of Time.