What is the author's style in Gideon's Trumpet by Anthony Lewis?

The perspective is entirely focused on the legal issues surrounding the case. For example, the only information about Gideon himself is the letter he wrote to his attorney in response to a request for background information. Gideon outlines his life in that letter, at least up to a point, but admits that even he might not be entirely honest because there are some aspects of his life that he simply doesn't want to remember. There is no indication of Gideon's fate past the moment of his release from jail.