There are 2 books in the Eliza Doolittle & Henry Higgins series.
The Eliza Doolittle & Henry Higgins series does not have a new book coming out soon. The latest book, Move Your Blooming Corpse (Book 2), was published in September 2015.
The first book in the Eliza Doolittle & Henry Higgins series, Wouldn't It Be Deadly, was published in September 2014.
The Eliza Doolittle & Henry Higgins series primarily falls into the Historical Amateur Sleuth Mystery genre.