Book for gifted 12 year old.

[Christopher Sawtell]

Greetings List,

   I need some guiding about a book title for a very talented girl of 
about 12 who is getting into squeak _very_ fast.

Is there anything out there - on paper or otherwise - which is between 
the "How to make a halo appear" type of tutorial and the complex 
utterances from the real cognoscenti?

Tnx a 10^6.

--
Sincerely etc.,
Christopher Sawtell.