In the stage play Spider's Web, Copplestone Court is an estate in Kent. It had been the home of antique dealer Mr Sellon, but after his death it was rented (very cheaply) to Henry and Clarissa Hailsham-Brown. The asking price was eighteen guineas per month, but Henry and Clarissa were told that they could rent it for only four guineas per month.
There is a hidden door in the drawing room, which leads to a small recess. Through there one can enter the library, via another hidden door.