Oz is in upheaval following the return of Martin Querns. Meanwhile, Howell and Robson each receive troubling news, Mukada answers an unsolved mystery, and the O’Reilys struggle to make amends….

All is crazy after Busmalis and Alvarez flee from Oz via one of Busmalis’ tunnels. Hernandez discloses details about the shooting to Glynn and mentions Tarrant getting the gun from…