John Grisham's first novel is special as it's the foundation of his literary legacy. It may have introduced themes that he would continue to explore throughout his writing career, like justice, morality in the legal system. It could also have been where he first developed his ability to create complex characters, from the lawyers to the defendants, which has become a hallmark of his work.
His first novel might be special for several reasons. It could introduce his unique writing style which often combines legal drama and suspense. For example, it might set the tone for his later works that are known for their page - turning plots and in - depth exploration of the legal world.
Well, it's special because it was the start of his successful career. It likely had the raw elements that attracted readers to his subsequent books. Maybe it had a particularly engaging protagonist or a really interesting legal case at its core, which made people take notice of Grisham as an author.