King of Swords picks up the story. Another amazing killing, and then a little different back story on El Rey, the King of Swords assassin. It's consistent with the prequel, but from a slightly different view that tells us more about him.
That's only a part of the book. The rest of the lead cop in Mexico tasked with controlling the cartels gets wind of a plot to kill the Presidents of Mexico and the US, who will be together in Cabo. No other groups thinks he has any evidence, so he must work to try and find out information and foil the plot.
The book alternates between El Rey and the cop, both working to complete their mission. It's an exciting end, but open ended. We'll see these characters again.