"Raid-nights!"
"You might be knocked on the head and removed as a casualty."
John Dene nodded, Dorothy gasped.
"Never take food or drink of any sort in your room at the hotel, and don't travel on the Tube or Underground, at least never stand on the edge of the platform, and don't use taxis."
"And what about a nurse?" demanded John Dene.
"If you observe these points I scarcely think one would be necessary," was the quiet rejoinder. "It would also be advisable," continued Colonel Walton, "for Miss West to be particularly careful about making chance acquaintances."
Dorothy drew herself up stiffly.
"During the last few days," continued Colonel Walton, "a number of attempts have been made by women as well as men."
"How did you know?" she cried in surprise.
"We have sources of information," smiled Colonel Walton. "For instance, the day before yesterday, at lunch, a pleasant-spoken old lady asked you to go with her to the theatre one Saturday afternoon."