Paul Mason 
The Twins and the Wild Ghost Chase [PDF ebook] 

There”s something unusual about Stella and Tom”s friends – they”re all a little bit dead! The ghosts in the castle are feeling homesick and so a ghostly road trip is the only cure. Can Stella and Tom get their friends home without the interfering ghost catcher, Stoneyheart, catching up with them?
Funny, exciting or a little bit spooky,
Black Cats are fast-paced stories with short chapters and illustrations throughout – stepping stones to reading confidence