It follows Merle (Allison Tolman, FX’s “Fargo”) finding her life beginning to splinter when Sinaloa (newcomer Sophie Reid), the musician half-sister she never knew existed, appears on her doorstep in Texas. As Merle allows her half-sister into her life, Sinaloa reveals a quiet fury through her music, and her fierce attachment begins to place Merle’s career aspirations, her relationship to her mother, and even her impending marriage, in jeopardy. What happens next to them?