Eight Dozen Agents

Published in Doc Savage, January 1947.
"A little snooping, a few lies, a gorgeous assistant, dozens of phone calls; and Benton Meredith Walters is here in another adventure against international intrigue."
Walters and Hilda set up their office and wait. After some days, instructions for the next mission comes in - a Nazi scientist, with bodyguards, was arriving by ship with a small amount of a deadly gas to test it on groups of unsuspecting Americans to gauge its effectiveness. The job for Walters and Hilda is to stop them before innocents get hurt.