There are 4 books in the Three Dark Crowns series.
The Three Dark Crowns series does not have a new book coming out soon. The latest book, Five Dark Fates (Book 4), was published in September 2019.
The first book in the Three Dark Crowns series, Three Dark Crowns, was published in September 2016.
The Three Dark Crowns series primarily falls into the Fantasy genre. This young adult series was written for ages 12-17, but can be enjoyed by adults too.