post mentioned three spies of different species in the Technic History:
Rax, from somewhere distant and unpronouceable;
Another hero of intelligence-gathering is Targovi, Tigery, who learns that:
there is discontent and a sense of betrayal in the Patrician System, especially among Navy personnel;
the discontent is being fomented with unfounded allegations, inflammatory slogans and hostile japes;
spacecraft have been seen to land surreptitiously on Zacharia island;
the recent Merseian attack was led with unprecedented stupidity, flying straight into an obvious trap;
however, the Terran fleet under Admiral Magnusson could have pursued its advantage and inflicted greater damage but instead allowed most of the Merseian armada to retreat;
Captain Jerrold Ronan, in charge of Naval Intelligence for the Patrician System, is displeased by Targovi's report and refuses to explain why, citing official secrets;
Jerrold hints that the landings on Zacharia are a secret Navy operation and orders Targovi to speak no more about them;
he adds that Targovi had no right to question Merseian prisoners and is qualified neither to discuss strategy nor to criticize Magnusson;
in fact, Targovi is ordered to drop this line of inquiry and not to initiate any further investigations.
What does all this mean? That Magnusson is about to rebel and is a Merseian sleeper.
However, the supreme spy of the Technic History has to be Aycharaych the Chereionite, an agent of Merseia, simply because he is an unprecedented universal telepath.