Germán is Argentine by birth, but has lived in Spain for thirty years with his wife Rosa and his daughter Lucía. On the day of the young woman's birthday, he receives a phone call that will force him to confront his past in a violent way. This Argentine exile then has to deal with the terrible experiences he experienced during the Argentine dictatorship while overcoming his current family problems.

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.