The success of Bereavement hinges on its cast, and they deliver. Spencer List gives a haunting, mostly silent performance as young Martin, conveying confusion and eventual desensitization with remarkable maturity. Brett Rickaby is terrifyingly unhinged as Graham Sutter, striking a balance between pathetic madness and lethal violence. Alexandra Daddario, as Allison, provides a grounded anchor; her performance adds emotional stakes that prevent the film from becoming a mere spectacle of gore.