My Friend's A Gris Kwok

Mike had no idea that his best friend Alex was a Gris-Kwok - he can turn into any living creature he chooses. But so can Alex's naughty little sister Polly, and it's not long before Mike and Alex are dealing with a whole heap of trouble! A hilarious and thrilling read. Particularly suitable for 6-10-s with reading age of 6+.