Jackal is primarily Bristish. Though his home is in Spain, he travels all over; Croatia and I think Estonia being another place. Headquarters is in Britain and New York is another place where people meet. The miniseries is set present day. I hope that answered your question, Mendalla.
Regarding Jackal being based off a novel, I have found lately more than a few shows and movies are basing them off novels. They are also doing sequels. Could Hollywood be running out of ideas?
Edit: The Jackal is the main target in the sense agent(s) are trying to kill him. He is always escaping by clever means and killing others. It’s streaming on Peacock if you want to watch it.