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(1965) "Agents Against the Empire"
Five Terran agents were sent on a suicide mission against the hostile Maahks and somehow returned. Atlan suspects that the agents have been replaced by enemy doppelgangers. The Terrans test the agents thoroughly, only to confirm their identity and story. Atlan remains unconvinced, but cannot persuade Perry to detain them any longer. I like how this one has the tediously perfect Rhodan sleeping a serious threat.
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