The Silver Linings Playbook question

I am looking for the name of a children's book in the UK. My boyfriend said it was about cavemen who solved problems quickly and he seems to think it is called The Quickerwits or something like that however I cannot find it online. Does anyone know the name of this book or the author?
Sorry for posting about The Silver Linings Playbook but I had to choose a tiltle yet I dont know the name LOL