Well, it often sets the tone for her later works in the mystery genre. It might introduce unique characters or a particular writing style that becomes her signature. For example, her characters could be complex and multi - faceted, with their own secrets and motives that draw readers in.
One of the things that could be special about her first mystery novel is the setting. It might be a very vivid and immersive setting that adds to the overall atmosphere of mystery. The setting could be a small town full of secrets or a big city with its own underbelly of intrigue. Also, her use of language in this first novel might be a standout feature, with her ability to create a sense of unease or anticipation through her words.
Kate Atkinson's first mystery novel is special because it likely showcases her creativity in constructing a mystery plot. It may have an engaging mystery at its core, full of twists and turns. The way she weaves clues and misdirections can be quite fascinating and different from other mystery novels of its time.