How many books are in the Duke's Sons series?

There are 6 books in the Duke's Sons series.

When will the next book in the Duke's Sons series be released?

The Duke's Sons series does not have a new book coming out soon. The latest book, The Duke Knows Best (Book 5), was published in December 2017.

The first book in the Duke's Sons series, Heir to the Duke, was published in January 2016.

Order	Book	Genre	Date	Rating
0.5	A Favor for the Prince	Historical Romance / HR	Jul-2020	0
1	Heir to the Duke	Historical Romance / HR	Jan-2016	3
2	What the Duke Doesn't Know	Historical Romance / HR	Sep-2016	4
3	Lord Sebastian's Secret	Historical Romance / HR	Jan-2017	3.5
4	Nothing Like a Duke	Historical Romance / HR	May-2017	4.5
5	The Duke Knows Best	Historical Romance / HR	Dec-2017	4