Steve Cole 
Invisible Inc. [EPUB ebook] 

Chaos, wizardry and a gang of kind-of ghosts, in this hilarious adventure from bestselling author, Steve Cole.
Noah’s mum’s new invention can zap ANYTHING into a ghost of its former self. It’s still there, but you can’t see it. You can’t touch it.
When the sinister ‘Seerblight Solutions’ steal her invention, Noah is zapped – and finds he’s not the first to have been turned ‘invisible’ through the ages. With all humankind in terrible danger, Earth’s last line is defence is one you’ve never seen or heard of:
Invisible Inc .
A medieval knight. A Victorian inventor. A poetic pony. And an ordinary boy.
Saving the world? THEY’LL SEE TO IT!