There are 3 books in The Macinnes Sisters Trilogy series.
The Macinnes Sisters Trilogy series does not have a new book coming out soon. The latest book, Highlander The Dark Dragon (Book 3), was published in June 2015.
The first book in The Macinnes Sisters Trilogy series, The Highlander's Stolen Heart, was published in June 2014.
The Macinnes Sisters Trilogy series primarily falls into the Historical Romance genre.