Like her classmates Iggy and Rosie, Ada Twist has always been hopelessly curious.

Why are there pointy things stuck to a rose?
 
Why are there hairs growing inside your nose?
 
She embarks on fact-finding missions and conducts scientific experiments, all in the name of discovery.
 
When her house fills with a horrific, toe-curling smell, Ada knows it's up to her to find the source.
 
But, this time, her experiments lead to trouble.