Zeta

In *Zeta*, four former Spanish intelligence officers are murdered simultaneously at various embassies around the world. The CNI discovers that all of them were involved 35 years ago in the covert “Operation Ciénaga,” which took place in Colombia and in which a fifth intelligence officer—the only one to have escaped the assassins—was implicated. Finding him will be the CNI’s top priority, and they put their best agent, Zeta, in charge of the mission. But Zeta won’t be alone on this mission. Colombia is also after him, sending one of its best agents, Alfa, who seems to know more about “Ciénaga” than Spanish intelligence does. As Zeta and Alfa advance in their investigation, they will navigate dangers and unearth secrets that have been silenced for years. The most hidden and powerful secret of all is the involvement of a sixth intelligence officer in the mission—a spy in the shadows whom no one knew anything about, the intelligence officer who appears to be the ultimate reason behind all the murders. His code name: CASIEL.