When Dr. Peter Fales's (Klaus Kinski) patients start getting annhilated by an unknown serial killer, he and his daughter Alison (Donna Wilkes) both come under suspicion. Part slasher film and part psychological thriller, Schizoid co-stars Marianna Hill as Julie, a syndicated "Dear Abby"-style columnist who also happens to be in one of Dr. Fales's therapy groups. After she receives several ominous letters she not only wonders if Dr. Fales might be behind the killings, she also starts to suspect her estranged husband.
~ Eleanor Mannikka, All Movie Guide