Claiming A:
@arlo: could you make the thread a wiki please?
Analysis
《今夜『は』もうお帰りですか? 先生…》
今夜【こんや】means this evening and it’s the topic of the sentence;
もう: means soon, shortly;
お帰り【おかえり】means return;
ですか: indicates a question;
先生【せんせい】as Jonapedia commented, a general sign of respect as it can mean both teacher and doctor depending on the context. Here though, I’ll translate it as “doctor”.
Interpretation:
Are you going to go return home soon this evening doctor?