Okay, So I don't know if there is a fourth book?? cause The Reckoning definitely left me hanging.

its called the Darkest Powers trilogy but now that u say it i hope so

i think there is going to be a 4th book in the darkest powers. theres the darkness rising book out called the gathering its about other edison group subjects. and i think on the website she said she wants to get their series started. ( i think im not really sure)

There is not a fourth book. As far as i know she is not going to make a fourth book. But she did write The Gathering. It has do with the Edison Group. The Other series she wrote, The Otherworld, also has to do with the Edison Group.

There is the trilogy the Darkest powers and then The Darkness Rising(It only has The Gathering out so far)They are the same series but Two trilogies, if that makes sence. The Gathering is about other subjects of the Edison Group. I heard in the end of the Darkness rising series that the two groups of characters would meet.

There are three novellas that will be on ebook. Dangerous is about Simon and Dereks story before the Lyle House. Divided is about when Chloe and Derek are apart right after the escape from the Lyle house, from Derek's POV. Then Disenchanted is when Simon and Tori are seperated from Derek and Chloe on the bus ride. But from Tori's veiw.

Then there is currently a story on the Darkest Powers website (Link Below)a few months after the Reckoning took place. I'd look at it soon. She is going to take it off soon and put it on ebook!

Then there is a book called Enthralled. Enthralled is a whole bunch of authors got together to make the book and each chapter is from a different author an is a different story. Kelley Armstrong wrote a chapter and it's about a few months after The Reckoning.
I hope this helped!

link