“I can answer for that,” said he; “Sinclair has been with me the whole time. No; there is another explanation for this.”
“What is that?”
“Why the same person who called us on the ’phone, and probably the murderer. It is curious how vain these people are. He may have stepped too far. It’s just possible he’s given us a valuable clue. One cannot send letters with impunity. There’s the post mark, and the time.”
“The document must be obtained,” said Boyce.
“I have already asked the Central News to send it here for inspection. It is coming now by hand.”
While they waited, Collins turned to Sinclair.
“About that telephone call, you say it was a woman’s voice?”
“Well, of course, I thought so at the time; but it may have been a man’s disguised.”
“Or something else?” said Collins.
“What do you mean?” said Boyce, almost startled.