Is it possible that more than 50 years after the assassination of Che Guevara, and after hundreds and perhaps thousands of biographers, analysts, journalists, and scientists researching the life and legacy of Che Guevara, it has not yet been discovered that one of Guevara's articles was published with a pseudonym in July 1967 in the most important journal of social sciences in Cuba, Pensamiento Critico? The author of this book proposes an affirmative answer to this question, revealing for the first time at a worldwide level, Che Guevara's possible authorship of a brilliant article studying the Bolivia situation in 1967, at the same time that Guevara's National Liberation Army of Bolivia was fighting against the military dictatorship of Rene Barrientos. The book provides a dense and rich series of arguments to prove this audacious historical conjecture. The reader must judge if these arguments are convincing or not.