There are 2 books in the WPC Billie Harkness series.
The WPC Billie Harkness series does not have a new book coming out soon. The latest book, Murder on the Home Front (Book 2), was published in May 2023.
The first book in the WPC Billie Harkness series, Death in a Blackout, was published in April 2022.
The WPC Billie Harkness series primarily falls into the Cozy Historical Police Procedural and Mystery genres.