The note, itself, had been mailed from the tenth floor of the hotel.
Cardona knew that The Shadow was right. The trail led back to Harshaw’s. But it led there in more ways than one.
Wilhelm had described the death package and its delivery. By the time the millionaire, pale-faced and excited, had arrived at the Redan Hotel, the police had trailed the package to its source.
The menacing bomb had lain in the express company’s office for nearly two weeks! It had been collected, with a note of instruction that it should be held until to-day.
The bomb, with its charge removed, had been brought to the Redan Hotel. The note was there also — a sheet of paper typed with capital letters.
According to the evidence at hand, that package had been taken up originally from this very hotel!
The clerk at the Redan remembered, now, that Homer Briggs had brought a package down from Silas Harshaw’s apartment, and had left it at the desk.
The old man had mentioned the package later. Unless a substitution had been made, the source of that mysterious bomb was Silas Harshaw himself!
Up in the old inventor’s apartment, Detective Joe Cardona was summarizing the matter.
With him were Commissioner Weston, Professor Biscayne, Doctor Fredericks, and Arthur Wilhelm. Detective Sergeant Mayhew was on duty outside the apartment.