The Fran With Four Brains

The Fran With Four Brains is the sixth book in the Franny K. Stein book series.

Plot
Franny barely has time for her experiments now that her mother has her signed up for bagpipe lessons, gourmet cooking classes and soccer practice, so Franny gets herself free time by creating a trio of Franbots, robots in her likeness who are each designed to do well in her extracurricular activities. Franbot 1 is built to handle bagpipe lessons with its powerful lungs, Franbot 2 is built with powerful legs to do well in soccer and Franbot 3 is designed to use its Food-Ray Blaster to create gourmet meals.

Franny enjoys the free time she has so much that she sometimes even has a Franbot go to school while she stays at home with Igor, but soon finds that the Franbots are more trouble than they are worth due to their obsession with achieving excellence depriving her mother of rest by dragging her into helping them with their projects.

Franny tries to tell the Franbots to slow down, but this only causes them to turn Igor into a tuna fish sandwich and decide to wipe out Franny, her family and the rest of humanity in order to eliminate all obstacles in their never-ending quest to achieve excellence.

Knowing that directly confronting the Franbots won't do any good, Franny disguises herself as a Franbot and decides to outsmart the Franbots in order to trick them into destroying themselves. She tells Franbot 1 that there are people who can hit a J note and dismisses the Franbot's objection that the musical scale doesn't go that high, resulting in the Franbot blowing so hard that it forces its insides into the bagpipe. Franbot 2 is taken down when it is told of a soccer player who can kick herself in the face, which ends with the Franbot kicking its own head off.

Franbot 3 turns out to have figured out that Franny has destroyed the other two and prepares to use its Food-Ray Blaster on its creator, but Franny is able to trick her creation into returning Igor to normal by requesting that the Franbot prove its culinary skill by making a dish called raw weasel-dog with monkey wrenches. Once Igor is turned back to normal, he and Franny use the monkey wrenches to dismantle the final Franbot.

Franny and her mother then agree that she doesn't need to take so many classes and should stick with what she's best at.