A whole lot of crazy things happen. Reporters disbelieving the inventor receive parcels containing invisible frogs! A thief steals a couple of vials, uses it for a bank robbery. An invisible dog, & sundry other invisible people at public places cause chaos, etc.
Fact sheet.First published: Fantastic Adventures, October 1940.
Read online at UNZ: part 1, part 2, & part 3.
Related: Stories of Henry Kuttner.