© UnknownShaken: Deborah Atsoparthis, right, with neighbour Kath Room, both complain they suffer sleepless nights
A strange sound that vibrates through the walls at night; no known explanation, experts confounded ... It's a mystery that some might consider just a little spooky.
Mother-of-three Deborah Atsoparthis, 54, just wishes it would stop.
The former executive PA has been driven to despair by the mysterious night-time noise that first disrupted her sleep in the small hours five months ago.
Since then the peculiar vibrating hum that reverberates through the walls of her two-bedroom flat each night has baffled a plumber, an electrician, a building surveyor and the noise experts at her local council's environmental health department.