From a New Yorker article about the French serial imposter Frédéric Bourdin (nicknamed “The Chameleon”):

…he tried to elevate his criminality into an “art.” First, he said, he conceived of…whom he wanted to play. Then he gradually mapped out the character’s biography, from his heritage to his family to his tics. “The key is actually not lying about everything,” Bourdin said. “Otherwise, you’ll just mix things up.” He said that he adhered to maxims such as “Keep it simple” and “A good liar uses the truth.” In choosing a name, he preferred one that carried a deep association in his memory….He compared what he did to being a spy: you changed superficial details while keeping your core intact.

This, too, is what the writer does…