When Arthur Morgan was in his twenties he discovered he had a younger sister. Lyle Morgan had an affair with a prostitute and had a daughter named Macy Morgan. He wanted nothing to do with them and kept them both locked away in a cabin off in the freezing, bitter Grizzlies; he'd visit once or twice and then disappear for good. Word got around that Lyle was hanged which lead to Macy's mother leaving to seek out answers but never returned. Macy being only 8 had to fend for herself and gets caught one day trying to pickpocket Dutch Van der Linde and Hosea Matthews; there the two men bring Macy back to camp and Arthur is reunited with his little sister. Flash forward 11 years later and an almost 20 year old Macy Morgan was trying to come to terms that a certain outlaw has caught her eye; bad thing is he's her brothers best friend and the father of her best friends son. This is Macy Morgan and John Marstons love story but through all the blood, tears and betrayal can their love last?