Whenever CIA agent Hiden is involved, this spells trouble for Mister No. And so, to help his friend Phil Mulligan, Jerry and Esse-Esse are obliged to cross the border and conduct a dangerous investigation among the beautiful homes and the sordid tenements and slums of Los Angeles. A labyrinthine puzzle where all of the protagonists seem to have something to hide or are duping other people by having a double identity and the unexpected ending will leave everyone with a bitter taste in the mouth!