Shenon argues that the Warren Commission was compromised from the beginning and that crucial evidence was withheld, particularly concerning Lee Harvey Oswald's time in Mexico City.
A major part of the book explores Oswald's 1963 trip to Mexico City, suggesting that the Cuban government might have influenced him, a possibility not fully explored by the Commission.
JFK: Caso abierto (A Cruel and Shocking Act) by Philip Shenon is a highly praised investigative history that focuses on the internal workings and failures of the Warren Commission, rather than just the conspiracy theories surrounding the assassination of John F. Kennedy.