All it tales to start a summer adventure is a pinch of Powder. It's the longest, hottest summer of all time and siblings Jim and Carrie are being force to spent it in their dreary new town of Claremont, Ohio. Desperate to escape their boredom, the two kids take a job looking after their neighbor's dogs and quickly realize they're in for a more exciting summer than they could have possible imagined.
There's more to Mrs. Simonson from down the street than meets the eye. She's a pulvologist, a scientist that makes powders that can dye hair green and makes broccoli taste like chocolate. In her laboratory she dreams of inventing a powder that turns things invisible. Jim and Carries summer is looking up but trouble arrives when sinister businessmen try to shut down their family bakery. Now, it's up to brother and sister to save the day. However they're about to learn that a pinch of powder might cause just as many problems as it solves.