Is I Still Know What You Did Last Summer based on a book?

Common questions

Is I Still Know What You Did Last Summer based on a book?

Yes. I Still Know What You Did Last Summer is based on the book I Know What You Did Last Summer by Lois Duncan (1973).

Who wrote the book I Still Know What You Did Last Summer is based on?

I Know What You Did Last Summer was written by Lois Duncan and first published in 1973.

Should I read the book before watching?

If you like knowing the full story and characters first, read I Know What You Did Last Summer before you watch. Adaptations often change or cut plotlines, so the book is a different experience even if you've seen the movie.