The other telepathic twin who ruthlessly continues their violent 'project.' He manipulates Eve, impersonates his brother to prove a point, forces their parents to kill each other, attacks Jonah, and sets the house on fire. He ends up paralyzed alongside his brother.
Their twin bond is central to the story, but it is damaged by their opposing moral choices.
The plot identifies Jonah and Seth as identical twin brothers who live together and conduct a violent project.
Seth deliberately exploits Eve's trust and attacks the meaning of her feelings for Jonah.
Seth impersonates Jonah and has sex with Eve to prove that she cannot distinguish the twins.
Seth becomes a primary target of Lampkin's investigation.
Lampkin summons the twins for interrogation, suspects them of telepathy, and confronts them at home.
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