ten minutes to ten
Something was very wrong , and she was alarmed . Suddenly , as a clock struck half-past six , he rose . '' _ Au revoir _ , my children , '' he said , `` I must get back home . Théo will call for you at ten minutes to ten , Brigitte , my -- my daughter ! '' And he was gone , leaving Théo staring after him . `` What can be the matter ? '' the young man mused .