Dementia 13 (1963)

Are you afraid of death by drowning? Have you ever attempted suicide? Have you ever thought of committing murder?

A widow deceives her late husband's mother and brothers into thinking he's still alive when she attends the yearly memorial to his drowned sister, hoping to secure his inheritance, but her cunning is no match for the demented, axe-wielding thing roaming the grounds of the family's Irish estate.