Detailed Explanation
The finale brings Mare face-to-face with an impossible choice. Her best friend Lori's son Ryan is the killer. When Mare discovers the truth, she must arrest the child of the woman who has been her rock through every tragedy. The ending shows the devastating aftermath: Lori's fury at Mare, the community's shock, and Mare finally climbing into the attic where her son Kevin took his own life—a place she'd avoided for years. The final shot of Mare beginning to process her grief offers a glimmer of hope in an otherwise tragic story.