The Invisible Fran

The Invisible Fran is the third book in the Franny K. Stein book series.

Plot
Franny K. Stein hears about her school having a day where everyone shows off their hobbies, with Franny annoyed that not one of her friends has any interest in pursuing mad science.

The young mad scientist is inspired by the sight of Igor getting swallowed alive by her chameleon to turn herself invisible and whisper suggestions to her friends Erin, Lawrence and Phil to make them interested in contributing to her Two-Headed Robot.

Unfortunately, Franny's plan backfires when the three kids decide to do work on the robot when Franny isn't around to instruct them, so their modifications to the robot make it become a destructive idiot who goes around vandalizing the school by leaving spitwads everywhere, writing graffiti and preparing to destroy all the library books.

Franny tries to sneak up on the robot and turn it off, only to find that Erin, Lawrence and Phil had installed a ketchup squirter in the robot's chest rather than an off switch. Erin, Lawrence and Phil rush over to help Franny, still trying to think like mad scientists, but Franny gets the idea that her friends' original hobbies might actually be useful after all.

She tells Phil to use stamps on the robot's eyes, blinding it. While the robot is distracted by its blocked vision, Phil makes good use of his accordion-playing skills by repeatedly bahsing the robot's two heads together. Finally, Erin dances on the robot until it is flattened up and broken into pieces.

Not wanting her creation to go to waste, Franny builds an oven from the robot's remains and invites her friend Billy over to bake pretty, pretty cookies, which are eaten by Igor.