The Bárbara de Braganza prepares to set sail from Argentina to Mexico but, first, Eva is asked to help undercover agents find a man harboring a virus.

When a serious crime occurs aboard the ship, Fabio warns Eva their mission is getting dangerous. Carolina becomes entangled in the mystery.

As the crimes continue, Eva's involvement raises suspicions. Fabio distrusts Carolina. The crew begins to have doubts about the captain's abilities.