What is the author's style in The Old Gringo by Carlos Fuentes?

The action in The Old Gringo is structured within a framing device; that is, the main part of the novel is "framed" by scenes of Harriet Winslow described in the present tense, sitting in her apartment in Washington and reflecting on events long past. Periodically throughout the course of the novel this present-tense Harriet is mentioned briefly, reminding readers that the story being told is not being narrated directly but is a summary of one character's memories. Many novels use a framing device to contain their story within a particular context, but The Old Gringo has an even more complex structure: it presents a frame within a frame.