Raymond Abrashkin and Jay Williams’ 1974 Danny Dunn, Invisible Boy is a juvenile SF story. It is the thirteenth (and third last) novel in the Danny Dunn series.
Scolded and humiliated when his paper airplane bounces off his English teacher mid-class, Danny Dunn wonders if his life would be better if he could be invisible at will. He discusses the matter with his chums Irene and Joe. Joe, who has been reading mysteries, suggests that misdirection is the best way to attain practical invisibility. Danny would prefer true invisibility, but is willing to give misdirection a try. The trio tries to use misdirection to steal cookies under the nose of Danny’s mom; they fail abjectly.
But Mrs. Dunn’s scientist employer, Professor Bullfinch, uses the distraction provided by the trio’s attempt to actually steal some cookies. Crumbs on the professor’s shirt give the game away.
This gives Danny to think. It reminds Danny that his mom’s boss is a brilliant if impractical genius. If anyone could figure out true invisibility, surely it would be Bullfinch