Meanings
good heavens, oh my God
"Poirot replied promptly: 'J stands for Jacqueline de Bellefort, a young lady who declared to me less than a week ago that she would like nothing better than to—' he paused and then deliberately quoted, “‘to put my dear little pistol close against her head and then just press with my finger—’” 'Gott im Himmel' exclaimed Dr. Bessner."