Christopher Wren is a freelance agent for the CIA.
That means that he works on assignments for the Agency but can pick and choose his missions. It also means that he can be more easily disavowed by them should something go wrong, in which case he is all on his own.
The missions in question invariably have one thing in common; they have something involving cults. The tag line to these adventures is that "it takes a cult leader to kill a cult" which fits perfectly. Wren's constant goal, the reason he accepts the CIA missions or goes alone when warranted, is to do whatever he can to break up the sort of cults that are peppered all around the globe.
Religious usually but sometimes political. Extremist in nature though he has seen up close over the many years he has been doing this work that there are levels of extremism.
None have yet reached the outer level that he knew as a child when he was a forced member of the Pyramid. "His father's cult. The cult he'd grown up in, the cult that had burned itself alive in a horrific act of mass suicide right here; an act Wren may or may not have helped bring about. Official records stated him as the sole survivor, though of course they'd never found his father's body..."
Wren is now in his mid 30's. For all of his adult life, from the time he was approached by the CIA while attending university, he has worked to find and rescue people who were like himself, victims of cults. He has even gone so far as to create his own sort of cult, the Foundation.
It is not found in any one place, unlike most cults. It is more an entity on the Web, or more accurately, the Dark Web. Its many followers are those that Wren has rescued and who now want to be part of rescuing others. The dedication and fervency that they demonstrate is really what makes them their own form of cult.
The devotion that Wren has to his Foundation and the work is does for the Agency comes from the knowledge that while the press reports about the demise of the Pyramid lists him as the sole survivor of the horrific end to that cult's compound, he knows in his heart that there was another survivor. Apex, the Pyramid leader and his father, is out there, planning. And what that man is planning is never going to be good.