At the center of this surprisingly good effort from the incredibly spotty Freddie Francis is Victorian scientist Cushing's attempt to develop an antidote for the blood-poisoning evil spread by an antediluvian skeleton that sprouts flesh when it gets wet. Fearing that his daughter will go
insane like her mother, Cushing gives her the serum he has created. Instead of becoming a saint, she turns into a sex-crazed murderer. Meanwhile, Cushing's ruthless brother, Lee, who is head of the asylum where Cushing's wife spent her last days, is obsessed with uncovering the source of evil and
steals the skeleton. A storm erupts during the coach ride from the lab to the asylum, ...