Help me find this childhood book

[bellashmobella]

I have googled so many things to try and find this book. It's about a young boy I believe and he goes to maybe Scotland to stay with relatives. In the night, he can't sleep and ghosts come to him. Something that might help is that there is a ghost that is only a foot. I believe there is people trying to buy the land and at the end there's something about unicorns and their horns.