CHAPTER XLVII.
THE HEEL OF ACHILLES.
"I shall be compelled to alter my theory at one point," said Shagarach.
"Yet your general conviction remains unchanged?"
"Absolutely. Your cousin is capable of the crime. A powerful motive was present. We have traced him to the door of the room. What factor is wanting?"
"I cannot believe it of Harry," said Robert, shaking his head doubtfully. "But what has occurred to cause you to reconstruct your theory?"
"My interview with Dr. Whipple, his physician."
"Harry was ill at the time, I believe?"
"He is able to prove an alibi."
"A hard obstacle to get over," said Robert.