An attempt to leave the island after Katherine has been killed turns into a disaster that will keep the remaining members of the wedding trapped for now. Meanwhile they find out a secret that will leave them reeling, and four more victims are claimed.

Abby confronts the killer, but the guests start thinking he may have an accomplice. Another guest dies and another goes missing.

Eight of the suspects battle for survival as the truth is revealed.

The answers are finally unveiled in the season finale.