There are 4 books in the 24 Hours - Final Countdown series.
The 24 Hours - Final Countdown series does not have a new book coming out soon. The latest book, Survive the Storm (Book 4), was published in May 2019.
The first book in the 24 Hours - Final Countdown series, Survive the Night, was published in October 2018.
The 24 Hours - Final Countdown series primarily falls into the Contemporary Romance genre.