The Ghost Brigades: Old Man's War Book 2

In John Scalzi's military science fiction sequel, The Ghost Brigades, humanity faces a deadly alliance of alien races led by a traitor whose death complicates efforts to uncover his plans. The story follows super-soldier Jared Dirac, cloned from a deceased scientist, as he trains with an elite unit of soldiers with similar origins. As Dirac struggles to access his memories, questions about trust and allegiance arise amid the ongoing space conflict.