Sicario: Day of the Soldado is the next chapter in the dark and intense franchise with Sicario 2‘s ending providing big twists, interesting developments, and a setup for more. Following a domestic attack, the US government decrees the drug cartels as a terrorist threat. Josh Brolin’s Matt Graver and Benicio del Toro’s Alejandro Gillick kidnap the daughter of Carlos Reyes, leader of one of the cartels, intending to frame it as an act from a rival gang only for the plan to go awry, leading to Sicario 2‘s ending.

https://screenrant.com/sicario-2-ending-explained-sicario-3-setup/