Lois Duncan is a skilled writer of children's suspense tales and I Know What You Did Last Summer is one of her best or certainly, because of the successful movie and sequal, one of her most famous. I originally read it in the seventies and was thrilled with it and became a fan of Lois Duncan and have since read it in the wake of seeing the movie and the book still holds up in the category of suspense. The lead character is well developed and very strongly written while the supporting characters add nice window dressing to the whole endeavor. People expecting the horror, gore, and death toll of the movie will be dissappointed. This is teen suspense of the old school variety.
I thought this book was excellent. It is about some teenagers who accidently committed a crime last summer but nobody knows that they did it. After that summer the teens are in their senior year of high school split up and try to forget what happened. Then the story mostly takes place the next summer when the teenagers are out of school for good and start getting notes saying "I know what they did last summer" the teens are being framed and need to figure out who knows there secret. Again, a very excellent book.
If you liked the movie or even if you just like a thriller you will love this book.
This is a good book but I saw the movie first which was a mistake.