Here's a good tween ghost story with a lot of plot twists and some creepy/somewhat-violent moments. It took me a while to get used to the main character Zack's shyness and introversion after just having read the confident, cocky narration of the boys in "Frindle" and "Swindle." Also, I read this one in spurts, and lost track of some of the characters and their...state of being living. So you might want to read this uninterrupted. I liked that there was an evil old lady, but NOT an evil stepmom. 
 The simplicity of the writing and Zack's young age, alongside the spooks and a couple deaths, occasionally made me wonder about the intended audience. Nonetheless, this is a great standalone book for Goosebumps fans who have read through R.L. Stine, or, gasp gasp, are looking for some less formulaic writing. 
 Also...best. cover. ever.