Alma the Younger by H.B. Moore

Alma the Younger, son of the aging high priest, once was taught by the wisdom of the prophets. Now, ensnared by the wiles of strong drink and harlots, he’s a bitter dissenter determined to overthrow the church and lead the people into new “freedoms.” But en route to one of his malicious missions with his royal henchmen, Alma is halted by an unexpected opponent: an angel of the Lord, a messenger of the very God he has sought to defame. What unfolds is a story of miraculous redemption, a story building on the poignant Book of Mormon account to show how even the vilest of sinners can be transformed by the Savior’s amazing grace.

Another well-written Book of Mormon story from author Heather Moore.
Alma the Younger has been raised in the Church of which his father, Alma the Elder, is high priest. But along the path of life, Alma the Younger chooses to exercise his free agency and rebel against his father and the church.
He justifies his anger at his father by 'preaching' to saints that the church is wrong and leading them astray. He doesn't realize the pain he is causing, especially to his parents.
He goes too far in leading people against the chuck and God sends an angel to Alma, a answer to many prayers including Alma the Elder.
Heather has added quite a few fictional characters to give the readers more depth to the scriptural ones. But it's not hard to separate them as the fictional names are not from the Book of Mormon.
The next book from Heather to look forward to reading is AMMON.

Here is a link to her website My Writer's Lair

Rating: PG
V: Some non graphic killings and fights
L: None
S: None

Page '69' Test:

"No...we aren't," he said, the words hanging heavy in the air. he couldn't stand it any longer, and he reached out and brushed the lock of hair hat had escaped her braids.

Cassia inhaled sharply, though she didn't move. is fingers lingered near her neck as he leaned toward her, dropping his voice to a whisper. "Do you ever wonder what might have happened if--"

Voices filled the corridor on the other side of the door. He straightened and let his hand hall.

Cassia put her finger to her lips until the hallway was silent again, her gaze holding his.

Alma's heart pounded as he looked at her. It was almost enough to make him want to make peace with his parents.

"I'd better return to the banquet before someone come looking for m," she said, breaking the tension of the moment.

Alma nodded, reluctant to move aside.

She hesitated, then touched his arm. "Don't do this, Alma," she whispered. "Come back to your family, to those who love you. Even if you don't know for yourself, trust in those who do." She reached up and kissed his cheek. "Please."

He stared at her, then opened his mouth to answer, but she disappeared through the door.