There are 4 books in the Allied at the Altar series.
The Allied at the Altar series does not have a new book coming out soon. The latest book, Captivated by Her Convenient Husband (Book 4), was published in August 2019.
The first book in the Allied at the Altar series, A Marriage Deal with the Viscount, was published in January 2019.
The Allied at the Altar series primarily falls into the Historical Category Romance genre.