go intoと言いますと「（部屋･建物･場所など）に入る」を想起しますが赤字の箇所は第五語義の「（事）を詳しく説明する[論ずる]」（『Wisdom英和辞典(第3版)』三省堂)という定義になります。(Shou-VR*)
Dana could hear the concern in his voice. 'I can't go into it all now, but some people are after me, trying to kill me.'
出典：Sheldon, S. The Sky is Falling.P.348
