I Am Slappy's Evil Twin (Goosebumps SlappyWorld #3) - R. L. Stine - Bog

Luke Harrison's dad makes horror movies, so their house has its own monster museum. But when two ventriloquist dummies join the collection, things get real creepy. Slappy and Snappy can walk and talk on their ownEand have a plan to make everyone's lives miserable. Will Luke be able to stop this terrible twin twosome? 5/8.