Monster Mountains by Marcus Sedgwick
Eep! Those mountains are scary! Saving the world is not going very well for Elf Girl and Raven Boy. It’s not the strange wailing noises they hear in the dark, or the gigantic yeti who wants to eat them for breakfast that they find alarming, so much as the crazy wizard, who wants to add them, and Rat, to his collection of all too life-like stone statues.
Perfect for you if you like scary, creepy stories!!
Age 8+
The great Weta Robbery by Peter Friend and Alicia Ponder
When your after-school job is looking after weta the size of cats, it’d be understandable if you thought that your life couldn’t get any more exciting or dangerous. But there is a darker secret lurking in the laboratories of Krell Research and it’s down to one boy to get to the bottom of it.
Do you love big creepy-crawlies ? If so you’ll enjoy this book!
Age 6 +
In a glass Grimmly, by Adam Gidwitz 
If you dare, join Jack and Jill on a harrowing quest through a new set of tales from the Brothers Grimm, Hans Christian Andersen, and others. This book will lead you into creepy forests, gruesome deeds, terrible monsters, and – far worse- the dark places of the human heart…
A fantastic eerie, subversive, and hair-raising companion novel to A Tale Dark and Grimm
Age 10+
When fairies go bad, by Ursula Vernon
Danny’s mother has disappeared into a fairy ring growing in her backyard vegetable garden, and Danny and his friends, Wendell and Christiana, must go to Faerie to try to save her.
And if you like this story, don’t miss the other books in the smoking hot Dragonbreath series !
Age 8+