I’m not a huge fan of Anthony Horowitz but I have enjoyed three of his prior mysteries, each from a different series.  The Magpie Murders ,The Word Is Murder, and Moonflower Murders https://mybecky.blog/?s=Horowitz  These are in two short but different series (out of five).  https://en.wikipedia.org/wiki/Anthony_Horowitz 

The Sentence is Death
by Anthony Horowitz 2017 / 
Read by Rory Kinnear 8h 56m
Rating:  B+/ mystery  

The Sentence is Death is the second book in The Word is Murder series featuring author Horowitz and PI Hawthorne.  

 Horowitz, a writer by trade,  is hired by Hawthorne, a private investigator,  to write about Hawthorne’s investigation into the death of Richard Pryce, a celebrity divorce lawyer.  Yes, Horowitz plays Watson to Hawthorne’s Sherlock.  (I love Sherlock Holmes and Dr Watson as written by AC Doyle. Fearing disaster, I was very late coming to this show but I don’t read any other Sherlock Holmes spins and there are dozens.  But I really enjoyed The Magpie Murders which features Susan Ryeland, an editor, as the protagonist so I opened myself up to The Word Is Murder, the first in this series.  

I have yet to read the two books which actually are Sherlock Holmes spins using the great detective himself.  
 
So — back to The Sentence is Death, who killed Richard Price?  Hawthorne is called and he calls Horowitz to help with the investigation and write a book. 
For the most part, this is an old-fashioned mystery so the clues start dropping in Chapter 2.  An expensive but broken bottle of wine next to the victim who was a tee-totaler, numbers painted in green on the wall, and a nasty note apparently from a noted feminist writer.  

https://www.bookcompanion.com/the_sentence_is_death_character_list.html
Hawthorne and Horowitz go out interviewing and putting clues together with Horowitz’s 1st person account.