Hereditary Instinct suggests that "blood will tell" no matter what one's upbringing. It begins when the heroine is raped while attending classes at Cambridge University. The assailant is the adopted son of a famed British barrister, who has been careful to rear the boy as a gentleman. It turns out that the rapist is actually the offspring of a notorious crook -- and as they say, like father, like son. Unable to control his hereditary impulses, the boy kills himself, but not before assaulting and murdering another unfortunate girl. Filmed as a silent, Hereditary Instinct was released with a hastily cobbled-together musical track. ~ Hal Erickson, Rovi