In the small tropical state of Mocamau someone is killing the members of a guerrilla group which had overthrown Colonel Arguedas’ dictatorship sixteen years before. One of the members of the group, Tito, an old friend of Nathan’s, asks the Agenzia Alfa for help. Jorge Cristal, one of the revolutionaries who has come back from abroad after many years, is convinced that Arguedas is still alive and has taken on the appearance of Keith Iron, the new candidate to the presidency of Mocamau…
Mr.Jinx (archenemy of Martin Mystere) and his protein computer are part of the main story in this episode.