While studying English at Cambridge, Ophelia Marsh begins an affair with charismatic lecturer Michael Callaghan. When he suddenly disappears, she tracks him to his family home in Ireland.

On hearing that his father has been taken ill, Michael returns to Cambridge where he learns that his dad received a mysterious visitor. Back in Knockdara, Ophelia receives a dreadful warning from a local psychic.

Ophelia begins to fear that Michael is not telling her everything, and must face up to whether she is losing her mind or whether something more sinister is afoot.

As the truth about Roisin finally breaks through the web of lies that has been spun between Cambridge and Ireland, Ophelia tries desperately to escape Knockdara.