Four Spanish ex-intelligence officers are assassinated simultaneously worldwide. The CNI discovers all participated in the covert "Operation Ciénaga" decades ago in Colombia. Zeta, the CNI's best operative, must hunt and protect the sole survivor, facing his deadliest global mission yet. Top Colombian agent Alfa will join Zeta, seemingly knowing more about "Ciénaga"'s secrets than him.

Madrid, 1974. Six years have passed since Martin and his family have returned to Spain from Switzerland. A visit to their adopted country will bring complications.

Ana, her mother and grandmother live in a small town in southeastern Spain where all three are regarded with suspicion.

After the closure of their shipyard in Northern Spain, a few former workers: Santa, José, Lino, Amador, Sergei and Reina keep in touch. They meet mainly at a bar owned by their former colleague Rico. Santa is the most superficially confident and unofficial leader of the group. A court case hangs over him relating to a shipyard lamp he smashed during a protest against the closure. José is bitter that his wife, Ana, is employed when he is not.