Where to start withI Know what You Did Last Summer
2 versions · originally a book, 1995
Themes: Guilt, Moral Dilemma, Hit and Run, Consequences, Secrets.
Start with I Know what You Did Last Summer (Lois Duncan, 1995) — the book. I Know what You Did Last Summer exists in 2 versions across media, beginning as a book in 1995; each is ranked below by what it does best.
A fatal road accident binds panicked drivers to a deadly secret that resurfaces with terrifying, conscience-shattering consequences.
✦ 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 I Know what You Did Last Summer focuses on Julie's crisis of conscience following a fatal hit-and-run accident, offering an intimate psychological focus on guilt.

1997 film
I Know What You Did Last Summer
Film · 1997
The 1997 film I Know What You Did Last Summer turns up visceral tension as four teens dump a body at sea, only to be stalked by a hook-handed figure.
Common questions
Was I Know What You Did Last Summer a book before it was a movie?
The book I Know what You Did Last Summer was published first in 1995. The feature film adaptation, titled I Know What You Did Last Summer, followed two years later when it was released in 1997.
What order should I experience the I Know What You Did Last Summer releases in?
Start with the original 1995 book I Know what You Did Last Summer, and then follow it with the 1997 film adaptation. Experiencing them in chronological order allows you to see the original source material before the screen version.
Is the movie I Know What You Did Last Summer an adaptation of the book?
Yes, the 1997 movie I Know What You Did Last Summer is an adaptation based on the 1995 book of the same title. The 1995 publication serves as the primary source material for the 1997 film release.
Should I read the book I Know What You Did Last Summer before watching the movie?
Reading the 1995 book I Know what You Did Last Summer prior to watching the 1997 movie gives you direct knowledge of the original source text before seeing the screen adaptation. Both works represent distinct releases of the title.