 Against Tris's former teacher, Niklaren Goldeye, Keth argued for Tris to kill the Ghost, on grounds that he was a murderer and deserved to die.Tris, however, decided against it.When Tris, Niko and Glaki left Tharios to travel north to Emelan, Keth remained in Tharios, expressing an interest in using his magic for forensics, despite his earlier statement that he'd become a glass-maker in order to create pretty things, not ugly ones.