Halo: Ghosts of Onyx begins in the year 2531 with a raid on an Insurrectionist base by the SPARTAN-II Blue Team. Their goal was to recover stolen FERNIS nuclear warheads, but were captured by rebel general Howard Graves; a former UNSC Marine who defected to the Insurrectionists. However, Spartan Kurt-051 manages to slip away from the team before they are captured, and helps the rest of Blue team escape Insurrectionist capture. One month after the raid, Blue Team is put on a mission to investigate