“We’re watched.”

“By whom?”

“Probably by the man who gave the note to the messenger boy.”

“What are you going to do?”

“I am going to call on the cashier of the safe deposit company.”

Half an hour later the detective was in the office of the safe deposit company. He and the cashier visited the vault, and, after some hesitation, the latter opened Lawrence’s box.

It was empty.

When this discovery was made, Carter uttered an exclamation of chagrin.

“Who could have removed the contents?” the cashier ejaculated. “Lawrence told me positively that he had valuable papers in this box.”

“They have been removed, but whether recently; or years ago, we cannot tell,” the detective said.