Mood

The book I am reading is The Secret Garden.  It's a mysterious book and there is this girl who goes to a castle with many locked rooms and she is going to live in a room that isn't locked.  The emotions I get from reading this book is  anxious because I want to know what is behind the locked doors and why are they locked.  This books makes me feel curious because I don't understand why the rooms are locked.  Did something happen in there? Is there something in there that can't be seen?