There are 4 books in the Trouble Wears Tartan series.
The Trouble Wears Tartan series does not have a new book coming out soon. The latest book, The Cowboy Wore a Kilt (Book 3.5), was published in March 2019.
The first book in the Trouble Wears Tartan series, Tartan Two-Step, was published in March 2017.
The Trouble Wears Tartan series primarily falls into the Contemporary Romance genre.