There are 3 books in the Horatio T. Parker series.
The Horatio T. Parker series does not have a new book coming out soon. The latest book, A Picture of Innocence (Book 3), was published in January 1996.
The first book in the Horatio T. Parker series, Unseen Witness, was published in January 1992.
The Horatio T. Parker series primarily falls into the Suspense genre.