And she was there! with Vernon and his two confederates.
"There's also something else strange about that house, Mr. Vidal," added Benham. "I dare say you didn't notice it in the dark, but away, half-hidden by the trees in the garden, there's a long stretch of four wires, suspended from two high poles. A wireless telegraph, I take it to be."
"Wireless at Merton Lodge!" I cried.
"Yes. To-day I asked a man who was repairing an underground wire in the Finchley Road, and he says it's a very powerful station, and he wonders that the Post Office ever licensed it."
"It was probably licensed as a small station, and then its power was secretly increased," I suggested.
"But you say that the young French lady is still there?"
"Yes," replied Benham, "she was when I left ten minutes ago."