In the season finale, when Danny intercepts a shipment of several million dollars that was heading to a drug cartel in Mexico, he becomes a target when they come back for revenge. Also, Jamie works independently to track down a serial killer who preys on the elderly.
Mary and Darnley are at odds as their plan to seize England is put into action; Elizabeth is conflicted about her feelings for Gideon; Catherine's son Henri tries to claim the throne from Charles.