"Goosebumps, The Ghost Next Door" by R. L. Stine

"HOW COME I'VE NEVER SEEN YOU BEFORE?"

Hannah's neighborhood has gotten a little... weird. Ever since that new boy moved in next door.

But when did he move in? Wasn't the house empty when Hannah went to sleep the night before? Why does it still look so deserted?

Hannah can't get any answers from her new neighbor. He just keeps disappearing in the oddest ways. And he's so pale...

Is Hannah being haunted by the ghost next door?