The throb of the motor came through the open window, and Miss
Howard rose and moved to the door. John's voice sounded outside.
With her hand on the handle, she turned her head over her
shoulder, and beckoned to me.

"Above all, Mr. Hastings, watch that devil--her husband!"

There was no time for more. Miss Howard was swallowed up in an
eager chorus of protests and good-byes. The Inglethorps did not
appear.

As the motor drove away, Mrs. Cavendish suddenly detached herself
from the group, and moved across the drive to the lawn to meet a
tall bearded man who had been evidently making for the house.
The colour rose in her cheeks as she held out her hand to him.

"Who is that?" I asked sharply, for instinctively I distrusted
the man.

"That's Dr. Bauerstein," said John shortly.

"And who is Dr. Bauerstein?"

"He's staying in the village doing a rest cure, after a bad
nervous breakdown. He's a London specialist; a very clever
man--one of the greatest living experts on poisons, I believe."

"And he's a great friend of Mary's," put in Cynthia, the
irrepressible.