Chapter 1
THE COMING OF TROUBLE
Chapter 2
THE GRAY DEAD
Chapter 3
SUBSTITUTED MESSAGE
Chapter 4
THE PERIL IN NEW YORK
Chapter 5
FIRING SQUAD
Chapter 6
ATTACK IN THE AIR
Chapter 7
AN OFFER TO SURRENDER
Dictator General of Delezon.
Chapter 8
SABOTAGE
Chapter 9
CRACK-UP
Chapter 10
THE KILLER LAUGHS
Chapter 11
DISASTER
Chapter 12
THE HUMORIST
Chapter 13
CHEMISTRY
Chapter 14
MORE TO DIE
Chapter 15
POLITICS
Chapter 16
FLIGHT AND PURSUIT
Chapter 17
THE GRAY DUST
Chapter 18
JUNGLE
Chapter 19
THE INCA IN GRAY
