Season 3 is absolutely worth the binge. I just finished the whole season and saw that not many posts explain the ending. So I thought I could give my insights on it:

SPOILERS AHEAD

With eyes on the courtoom, the final episode brings resolution as Mickey exonerates Julian from his charges by having Bishop tesifies against DEA agent De Marco, who fled the scene afterwards, and we see the jury brings the charges down thus freeing Julian.

Mickey isn’t done yet and is set to bring charges against the DEA so he has Cisco collect all the evidence against De Marco and his dealings with the Juarez cartel which led to the murder of Glory days to keep her slient. The DEA offers Mickey and Julian a deal that amounts to millions of dollars (the amount wasn’t literally disclosed).

As Mickey, Lorna, Cisco and Izzy enjoy the victory while having a dinner, Mickey decides that he will take a vacation and we see him leaving the restaurant and riding his car enjoying the peace after the battle until of all of the sudden, he is pulled over by the LAPD and is asked to give his license and registration. The officer sees a droplet of blood trickleing down the car’s trunk therefore he handcuffs Mickey and opens the trunk only to find the body of Sam Scales which was a total shock to Mickey. Aparently, someone from the Juarez cartel set Mickey up since the case of Julian freed not only Julian but also Hector Moya who is the Juarez cartel classic foe. The Juarez cartel now has their classic enemy back in the streets and they want to take revenge against Mickey, at least that what appears to be the reason for the corpse found in the trunk. Lets wait till season 4 :).

full recap is here