Trapped in Bat Wing Hall is a novella written by R. L. Stine. It was first published in 1996 and was the 3rd book in the Give Yourself Goosebumps book series.
Description[]
Reader beware--you choose the scare! GIVE YOURSELF GOOSEBUMPS!
Being the new kid in school is no picnic. At your old school you had tons of friends, but now you don't even have one. Then you meet Nick. He asks you to join Horror Club.
The Horror Club meets in an old mansion known as Bat Wing Hall. It's dark. It's spooky. And it's where your adventure begins. The members of the Horror Club are going on a scavenger hunt. If you join the red team, you find out the truth about your new friends- they're actually monsters! One is a green-skinned reptile. Another is a hulking giant! If you join the blue team you get turned into a furry-faced vampire bat!
The choice is yours in this scary GOOSEBUMPS adventure that's packed with over 20 super-spooky endings!