New Book: Detectives in Togas

I am reading the book Detectives in Togas. The book is in the mystery genre. In the book, they start With cauis and Rufus getting in a fight. Rufus writes "Cauis is a dumbell" on a writing tablet. then they find there teacher bound and gagged in his closet. Later, a group of schoolboys try to find their friend, Rufus innocent. It is said that he wrote "Caius is a dumbell" on a temple wall. He denies that he wrote it.