Sweet Valley High

Sweet Valley High is a novel series created by Francine Pascal, who presided over a team of ghost-writers for the duration of the series.The books chronicle the lives of identical twins Jessica and Elizabeth Wakefield, who live in Sweet Valley, California. The twins and their friends attend Sweet Valley High.

The series began in 1983 and ceased publication twenty years later with over 152 books to its name. Over the years, the books were written by many ghostwriters. The books are generally classified as young adult, teen or kids' fiction and mostly belonged to the genre of soap opera, romance novel, or fantasy-adventure.The series quickly gained popularity and spawned several spin-off series, including Sweet Valley Senior Year and Sweet Valley University.  *taken from Wikipeda.