Alma Ch20

Now that the people of Lamoni are mostly converted, the Lord needs Ammon to rescue his brothers in Middoni. He goes with Lamoni and on the way run into the king over all the land, who just happens to be Lamoni's dad. Ammon convinces him to approve the release of Aaron, Muloki, and Ammah by strong persuasion.
Lamoni has done so much missionary work with Ammon with his own people he wants to share it with his father in the land of Nephi (v1). Ammon is told by the Lord it would be unwise to meet the king but instead they need to go save Aaron, Muloki, and Ammah who are in prison in Middoni (v2-3). Lamoni has complete faith and trust in Ammon and agrees to go with him because as a king, he is friends with the king over there who is Antiomno (v4). After hearing that God was the one who revealed this knowledge to Ammon, Lamoni got his chariots ready and they left for Middoni (v5-7).
During their journey, guess who they run into. Just guess. Did you guess Lamoni's dad the king over all the Lamanites? Well if you did, you are correct, and yes he is the same person that Ammon was just advised not to go see because he would want to kill him (v8). Now daddy was a little bit upset with his son for not coming to join him for a feast just for his sons and for traveling with a Nephite (it was frowned upon still), so he asked of Lamoni whats going on (v9-10). Lamoni answers and says where they are going, and also why he couldn't come to the feast because of all the crazy fainting, converting, and all that had happened among his people (v11-12).
The king is very angry to hear all these things and commands Lamoni to kill Ammon and come home with him, to which Lamoni refuses both and testifies that he knows Ammon and his brethren are holy prophets of God (v13-15). Ammon intervenes when the king tries to kill his son and straight up tells him that Lamoni would be better off dying than he would because Lamoni has repented of his sins and is innocent (v16-18). The king rethinks his actions, and then turns his blade in blame towards Ammon for ruining his son (v19). We already know the outcome because of the protection spell on Ammon from the Lord at the beginning of his mission. Ammon wins by a landslide and offers the king his life if he will grant his brethren their freedom (v20-22).
The king was scared and offered Ammon anything he wanted up to half his kingdom to spare his life (v23). Ammon only requests the freedom of his brethren and that Lamoni will keep his kingdom and not be subject to his father, which showed the great love that Ammon had for the king's son which and he agrees to the terms (v24-27). This example that Ammon sets helps ignite a desire for Lamoni's father to learn more of the words that he heard and he becomes an investigator that we will learn of in two chapters.
After the escapades with Lamoni's father, the group frees Aaron, Muloki, and Ammah from the prisons of Middoni where they had been suffering from many afflictions patiently (v28-29). They had traveled to a meaner group of people than Ammon had, and were driven out of place to place until they were cast into prison in Middoni (v30).