"If you knew what was in that envelope, my dear financier, you might not speak so hastily. If I knew what was in it, I might answer you. But I don't know. I only suspect—and hope."
While he spoke the bandit was backing toward the door that opened upon the lower hallway of the house. He drew this door open, glanced swiftly out into the hall, and then placed the key on the outside.
"And now, my friends—au revoir!"
The Masquer sprang backward into the hall. The door slammed, the key clicked. He was gone!
Maillard was the first to wake into voice and action. "The other door!" he cried. "Into the dining room"
He flung open a second door and dashed into the dining room, followed by the other men. Here the windows, giving upon the garden, were open. Then Maillard came to a sudden halt, and after him the others; through the night was pulsating, with great distinctness, the throbbing roar of an airplane motor! From Maillard broke a bitter cry:
"The detectives—I'll get the fools here! You gentlemen search the house; Uncle Neb,
