[I Know What You Did Last Summer is a] slick whodunit, pedestrian in style, mediocre in characterization, but suspenseful to the end. Four teenagers—friends who have drifted apart since they were involved in a hit-and-run accident—are jolted by a series of ominous notes and phone calls from someone who is on to their crime…. False leads and several suspicious characters will keep readers guessing the identity of the vengeful enemy and may even divert some from the regrettable fact that the four protagonists are too vapid to merit any real concern.
Linda Silver, in her review of "I Know What You Did Last Summer," in School Library Journal, an appendix to Library Journal (reprinted from the April, 1974 issue of School Library Journal, published by R. R. Bowker Co./A Xerox Corporation; copyright © 1974), Vol. 20, No. 8, April, 1974, p. 64.