This film is a sequel to "I Know What You Did Last Summer". In the original film four friends just out of high school are out late celebrating the Fourth of July when their car strikes a man. Rather than report the accident, they dump the still barelyn alive victim at sea. One year later, they are stalked by someone who knows what they did last summer.
Another year has passed, and a chance for a vacation on a tropical island - what seems to be a chance to escape and forget about the past, to get away from it all. It starts out relaxing enough... but becomes yet another nightmare as they realize the horror is far from over. Someone on the island knows what happened, and now they are trapped with no escape...