The Betrayal, 1

Through 20 books, R.L. Stine has alluded to the cursed Fear family, whose mansion burned down in a terrible fire. All that remains of the Fears is a legacy of evil. Now Stine takes readers back in time, telling them finally the awful truth of what happened to the Fears . . . and why their evil lives on after 300 years.
Nora knows the secrets behind the horrifying things happening on Fear Street and reveals the dark legacy that marked the start of the terror three hundred years earlier, when a young girl was burned at the stake.