The Orinoco Flow songwriter lives alone in a castle in Dublin, Ireland, which she bought in 1997, and she has installed a panic room and reinforced the surrounding walls and gates after a number of trespassers managed to breach the grounds.

Enya admits she still has an ongoing problem with intruders, and police officers are currently investigating after she received a frightening letter.

"It's been traumatic," she tells Britain's Independent newspaper. "I get letters from people saying they are coming to meet me. But, you know, I sympathise with these people because I sense that they are very disturbed. They are leaning towards the music, or to me, for other reasons. They need help."

The star goes on to insist she cannot say more on the topic because, "The police are investigating."