Suddenly, Clara, Mónica's daughter, falls into a deep coma. With Clara left to die, a mysterious man proposes Monica to make a pact: Clara will be saved if Mónica does something for him.

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.