An Australian couple takes a sailing trip in the Pacific to get over the recent loss of their son. While on the open sea, they come across a sinking ship with one survivor who is not at all what he seems.

On their way to an afternoon on the lake, husband and wife Andrzej and Krystyna nearly run over a young hitchhiker. Inviting the young man onto the boat with them, Andrzej begins to subtly torment him; the hitchhiker responds by making overtures toward Krystyna. When the hitchhiker is accidentally knocked overboard, the husband's panic results in unexpected consequences.