Mary McMillan

This biographical miniseries, based on the best seller by C. David Heymann, starts when Jackie Kennedy was working after college; and spans her life through the Presidency of John F. Kennedy and her marriage to Aristotle Onassis after the assassination of President Kennedy.

After four high school friends are involved in a hit-and-run road accident, they dispose of the body and vow to keep the incident a secret. A year later, they each start receiving anonymous letters bearing the warning "I Know What You Did Last Summer."