The New Bobbsey Twins #5: The Case of the Close Encounter by Laura Lee Hope

and

Cunningham and Petrov: The Mystery of the Missing Agent chapter 16

WHOOOOOOOSH!

David was famous for his sneezes – but this was a really out-size one, a most magnificent specimen. It not only startled David; it startled the other three children, too.

But it startled the little watching man very much more!

An accidental human sneeze is as good as a parrot’s deliberate noises in Adventure of the Strange Ruby.

The illustration is from the magazine serialisation rather than the first edition, which had a different illustrator.