Nancy Drew The Clue of the Dancing Puppet by Carolyn Keene

Nancy's 39th mystery involves a dancing puppet!!! In this new mystery she goes to Van Pelt Estate where the Footlighters perform plays.The owners of the place say that they've a puppet dancing in the field outside their house at night. They say the puppet looks as big as human and has no strings attached to it. Nancy and her friends- Bess and George have to uncover the mystery of the life-size puppet.