Ruby Falls is a sleepy town. But sleep brings nightmares, and 20-something Lana is about to wake up in the middle of her hometown's biggest secret: the 'disappearance' of Betty Gallagher, who was infamous for her progressive ways during the mobster-ruled heyday of this old mining town. The dim details of this cold-case murder are trapped in the mind of her grandmother Clara, who suffers from dementia. When Clara starts to share these deeply-buried, violent memories with her, Lana is hooked. She becomes obsessed with cracking the case, even if it means snapping the minds of everyone involved.