What is the title of this book?

It's a kind of ghost/horror book, and I can only remember small details from it. Here are some:

-There was a rhyme about seven steps that lead down to hell and the children used to look for them in the woods

-There was a kind of ghost of a dead little girl that used to kill animals for fun (scene of her beating a pet to death with a stick)

-The ghost of the dead girl's brother pretending to be a high school student

-They go into the sewers at some point

Sorry there's so little to go on! I read it years ago and simply cannot remember the title. If you have any idea of what the title is please answer, but please do not answer just to give me suggestions of books to read--my list is already long enough.