Remember reading Sweet Valley High books as a kid? This is the quick-hit version, with excerpts from the books #40-#55. Formatted in the style of a diary, you get all the plot and important bits from the books without having to actually hunt each one down and read them. (I mean, it's teen fluff. You miss very little with these abridged versions.)
If you read the Sweet Valley HIgh books, this one is a must. It's all told from Jessica's point of view, just like it's taken out of her diary. She alludes to scenes from many other books, but has a new outlook on it. This one is mainly about her relationship with Todd, her sister's boyfriend!