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.