eleven o’clock
. `` You said in your evidence that Captain Tremayne arrived at Monsanto between half-past eleven and twenty minutes to twelve ? '' `` Yes , sir . '' `` You told us , I think , that you determined this by the fact that you came on duty at eleven o'clock , and that it would be half-an-hour or a little more after that when Captain Tremayne arrived ? '' `` Yes , sir . '' `` That is quite in agreement with the evidence of your sergeant . Now tell the court where you were during the half-hour that followed -- until you heard the guard being turned out by the sergeant . ''