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.

When their beloved farmer is found dead under mysterious circumstances, a flock of the sheep conclude they will have to solve the murder themselves, even if it means leaving their meadow for the first time and facing the fact that the human world isn't as simple as it appears in books.