“I have looked up the details of the four diamond robberies,” said the assistant, “and here is the report.”

He handed his chief a typewritten roll of at least twenty thousand words. Nick glanced at the length of the document, and asked:

“How many hands show plainly in these jobs?”

“One in the last three,” was the reply.

“And all these are of recent occurrence?”

“Yes, of very recent occurrence.”

“And the proof points to a woman?”

“Exactly.”

“What sort of a woman?”