Lorenzo Falco, an intelligence agent, works domestically and abroad, he is sent on the most difficult missions, he can get out of the most difficult situations. This time, Falco needs to disguise himself and, under a false name, gain the trust of representatives of the enemy camp in order to rescue from captivity an important person, in whose fate not only Spain is interested. Like the hero, the novel is also disguised - as a spy thriller and historical adventure, but Beneath the genre mask lies a dramatic story of betrayal and honor.