about ten o'clock at night
For four hours one of the two sat with eyes never moving from the street and the windows of the house across the street ; and then he left the post , and the other took it . It was vastly wearying work . Very few vehicles came into the light of the street lamp beneath them , and every person who dismounted from one of them had to be scrutinized with painful diligence . Once a girl , young and slender and sprightly , stepped out of a taxi , about ten o'clock at night , and ran lightly up the steps of the house . Ronicky caught his friend by the shoulders and dragged him to the window . `` There she is now ! '' he exclaimed .