Friday was held by the man's iron will to succeed or die. Without hesitation he whispered back:
"Yes, suh!"
Their whispers had been low. Dr. Ku Sui had not been warned, for the screen still showed him bending over his victim.
"You'll open the door; you're nearest. I'll go through first," the Hawk murmured, and smiled at the loyalty behind the promptness of his man's grin of understanding.
Then both smiles faded. The muscles of the negro's huge body bunched in readiness for the signal as tensely he watched the flaxen-haired head close to him.
Suddenly it nodded.
The door swung wide and white man and black went charging out.
And immediately there burst in their ears the furious clanging of a general alarm bell, sounding throughout the whole building!
CHAPTER XI
Trapped in the Laboratory