Bloodline Killer" delves into the harrowing tale of Moira Cole, who strives to piece together her shattered life following the brutal murder of her family by her deranged cousin, Lee Morris. Moira, now residing in the tranquility of suburban life with her sons, is haunted by her past, compounded by the popularity of a horror franchise titled "The Skulleton," which narrates her survival story annually. As Moira attempts to move forward, the sinister presence of her cousin looms large, threatening to unravel the fragile peace she has managed to build.