"All right," David agreed, "but we don't know how to get out and it's time
His voice died away in a gasp of surprise and fear as he grabbed Jon's arm and swung him round so that he was facing the wall at the end of the room. There were bookshelves on which were magazines, cups, a teapot, a half-empty milk bottle and the telephone. Suddenly, a vertical line of orange light appeared on the wall behind the shelves... Slowly the secret door opened and in the gap a man's hand appeared!
