“And the message?”

“How did it run? ‘Our own colours, green and white.’ Sounds like racing. ‘Green open, white shut.’ That is clearly a signal. ‘Main stair, first corridor, seventh right, green baize.’ This is an assignation. We may find a jealous husband at the bottom of it all. It was clearly a dangerous quest. She would not have said ‘Godspeed’ had it not been so. ‘D’⁠—that should be a guide.”

“The man was a Spaniard. I suggest that ‘D’ stands for Dolores, a common female name in Spain.”

“Good, Watson, very good⁠—but quite inadmissible. A Spaniard would write to a Spaniard in Spanish. The writer of this note is certainly English. Well, we can only possess our soul in patience until this excellent inspector come back for us. Meanwhile we can thank our lucky fate which has rescued us for a few short hours from the insufferable fatigues of idleness.”