Chamaeleon: The Secret Spy by Lynda Wilcox
Approx. 35,320 words.
Published on October 29, 2011.
Kel is a very special thirteeen year old with the unique ability to disappear into any background. With his country under threat from the evil Grey Lord, Kel is recruited and trained as a spy. Together with Rostyn the King's Messenger, he is sent to infiltrate the forbidding Grey Keep and destroy their enemy's deadly new weapon.