Something scary is happening in Goosebumps HorrorLand, the all-new, all-terrifying series by R.

L. Stine. Just how scary? You'll never know unless you crack open this classic prequel!

Carly Beth thinks she's found the best Halloween mask ever.

With yellow-green skin and long animal fangs, the mask terrifies the entire neighborhood.

Before long, it has a surprising effect on Carly Beth, too.

She tries to take it off ...but it won't budge!