The Overnights by Ian K. Smith
Ashe Cayne a ex-cop, Chicago private investigator is hired to protect a local anchor woman that has been receiving threatening letters and has an ex-stalker recently out of jail.  Additionally he uses his PI skills to research assist her in her reporting of a police shooting that is much more than it seems.

Entertaining story - read in one sitting. Although this is book 3 in the series I didn't feel lost in an unknown backstory.  And a high compliment to an author, I will be seeking out Ian Smith's other Ashe Cayne books to read and with plan on following this series in the future.

Starred Review:

Ian k. Smiths now third novel featuring Ashe Cayne is a homerun. Old school detective novels that are now present day updates. Based in Chicago Cayne is asked to look into the threats to a huge mega late news anchor who is being threatened by a unknown person. Meanwhile Cayne is helping her with a police shooting to garner high TV news ratings. 

The third Ashe Cayne novel. Please return to the debut and read all three. They are fantastic vintage crime noir. Highly recommended.