six o'clock
` Impossible ! ' said the Head again . What Mr Merevale had said in his note was this , that Thomson was not in the House , and had not been in the House since lunchtime . He ought to have returned at six o'clock . It was now half-past eight , and still there were no signs of him . Mr Merevale expressed a written opinion that this was a remarkable thing , and the Head agreed with him unreservedly . -LSB- 16 -RSB-