Suzie and Mary become suspicious that something sinister is going on when a young couple, Antony and Daria, who are spending a relaxing weekend at Dune House leave unexpectedly and then have an accident. With Daria missing and Antony dead, Suzie and Mary do everything they can to find out the truth in the hope it will lead them to Daria. Their investigations lead them straight towards some serious criminals. Will Suzie and Mary be able to find Daria and uncover the truth? Does Mary have a new love interest or is he just using her to get information? Will Suzie's meddling ruin her relationship with her cousin, Jason?