Part of the I Know What You Did Last Summer franchise, the series is a modern take on the original novel and follows a group of friends stalked by a brutal killer one year after covering up a car accident in which they killed someone.

It features a cast led by Madison Iseman, Brianne Tju, Ezekiel Goodman, Ashley Moore, and Sebastian Amoruso, and also stars Bill Heck, Fiona Rene, Cassie Beck, and Brooke Bloom.

On July 26, 2019, it was announced that Amazon Studios would develop a television series based on the 1973 novel I Know What You Did Last Summer by Lois Duncan, with Neal H. Moritz and Pavun Shetty of Original Film serving as executive producers and Shay Hatten writing the pilot.

It was also announced that Goodman and Hatten would serve as executive producers on the series, alongside Erik Feig of Original Film and Rob Hackett, Michael Clear, and James Wan of Atomic Monster.

[4] On January 11, 2021, Madison Iseman, Brianne Tju, Ezekiel Goodman, Ashley Moore, Sebastian Amoruso, Fiona Rene, Cassie Beck, Brooke Bloom, and Bill Heck were cast in starring roles.

The website's critics consensus reads, "A bloodless slasher that fails to congeal, I Know What You Did Last Summer's killer cast can't make up for the show's many plot holes and unsatisfying twists.