It was after midnight now, and the two men who had been so critically injured by the explosion at the cement plant tonight had been wheeled out of surgery and into private rooms. In the office of the chief of staff, it was a tired little group, who after the pressure of the last few hours sat drinking coffee discussing the events of the night. Dr Paul looked at the report of the emergency treatment administered to the two men at the time of the accident. The handwriting was very familiar to him, but as to the identity of the writer, neither his assistant, nor his head nurse could tell him anything beyond the fact that the writer was a young woman.