Within These Walls is a detective novel written by Rupert Hughes. This book tells the story of mysterious events in an old castle, where the mysterious disappearances of other wealthy residents begin. The main character is a brave detective who decides to solve these mysteries, revealing layer by layer the history of this mysterious place. The book is full of social conflicts, intrigues and unexpected turns of events that keep the reader in suspense until the last page. "Within these walls" is an exciting journey into the world of secrets and danger, which is difficult to put down until the very end of the book.