This is a detective novel surpassing most that I've read. It has characterisation, plot, mood, dimension and betrays a skill in construction. All of this should be a clue that this book is more than possible in a first novel.
I chose this for my Mum to have on her bed when she went into a nursing home and it was a brilliant match for the curtains we took also. The idea was to make the room seem as her own bedroom. Brilliant quality and weight.