There is boy called Henry who is twelve years old and whose parents kidnapped for unknown reasons. They are traveler writers we just know this information.  Henry came from Kansas and he moved to his uncle's house. He is living with 3 cousins , his uncle and his aunt. Henry's uncle name is Frank , his cousins Anasteasia, Henrietta and Penelope but they call him Penny and his aunt's name is Dotty. For now Henry seems calm about his family. He came to the house and he had a conversation with his cousins about a boy and they joke each other.
Henry realized , there are some different things in the house. For example he learnt that there is a door locked for 2 years. In the past it was the granddad’s room but this room is locked since granddad died.  One day he couldn’t sleep because he heard freaky sounds from the wall. He got out of bed and he went to bathroom. He saw a light in the bathroom and he waited in the stairs. When the door opened , Henry saw an old man and old man went to granddad’s room. Henry thought it was just a dream. Everything goes well until night comes. Another day he couldn’t sleep because of freaky sounds either but this time he found a plaster in his hair. He didn’t know where it came from but then he saw two knobs which had broken. Knobs look mysterious and Knobs have different symbols.Henrietta saw that wall and Henry and Henrietta knew what happened in his room. They thought they shouldn’t say it to Uncle Frank or Dotty, or cousins.They wanted to find what was the wrong about the door , sounds and knobs.