Nathan Wyeth finds himself hopelessly in love with a woman named Sheila, not realizing they are both vampires. When she disappears without a trace, he is joined by his friend Ronnie, trying to find some meaning in her mysterious existence. Ronnie falls in love with Nathan, not realizing he is a vampire. Lieutenant Joe Mace, investigating the violent murder of Ronnies husband, runs into government-funded groups bent on controlling vampires, conducting a program to resocialize them by medical treatment. When Nathan relapes from his treatments he is taken into custody by the vampire control...