Reading list: Zodiac Chillers
A short-lived zodiac-themed horror series.
Books 7 and 8 appear to have never been published, but have known descriptions.
Planned titles for the rest of the series according to an ad in Pisces Drowning:
9: Gemini Divided, 10: Claws of Cancer, 11: Psycho Sagittarius, 12: To Kill a Capricorn and 13: The Aries Oracle.