Where to start
I Know what You Did Last Summer
3 versions · originally a book, 1995
This saga explores the psychological unraveling and inevitable terror that follow a shared, lethal secret kept by teenagers.
✦ Most fans start here
I Know what You Did Last Summer (1995)
The original novel
✦ Start hereI Know what You Did Last Summer
Lois Duncan · Book · 1995
The 1995 book by Lois Duncan prioritizes a tense, character-driven exploration of guilt and conscience, making it the essential starting point for readers who prefer suspenseful, grounded psychological drama.
1997 film
I Know What You Did Last Summer
Film · 1997
The 1997 movie transforms the story into a slasher spectacle, replacing internal dread with a hook-handed killer, perfect for viewers seeking classic late-nineties horror tropes and high-stakes cinematic jump scares.
Inspired by
Scary Movie
Film · 2000
The 2000 film Scary Movie serves as a razor-sharp satire that deconstructs the slasher genre, offering a hilarious, irreverent experience for audiences familiar with the tropes established by the previous versions.
Common questions
Should I read the 1995 book before watching the 1997 movie I Know What You Did Last Summer?
You can choose either format first. The 1997 movie I Know What You Did Last Summer is an adaptation of the 1995 book. Both versions tell the same core story, so the order does not impact your ability to understand the plot.
Is the 1997 movie I Know What You Did Last Summer related to the 2000 film Scary Movie?
The 2000 film Scary Movie is a parody that directly references the 1997 movie I Know What You Did Last Summer. While they are not part of the same narrative series, the comedy film relies on viewers recognizing scenes from the 1997 slasher movie.
What is the source material for the 1997 movie I Know What You Did Last Summer?
The 1997 movie I Know What You Did Last Summer is based on the 1995 book of the same title. The film adapts the events and themes originally written in the 1995 novel for the screen.
How many versions of I Know What You Did Last Summer are mentioned here?
There are two versions of I Know What You Did Last Summer referenced here, which are the original 1995 book and the 1997 movie adaptation. These are distinct formats of the same title, separate from the 2000 parody film Scary Movie.