A Goodreads user
A Goodreads user asked Ed McDonald:

how many books are planned for the series?

Ed McDonald Hi Thomas!
Although Blackwing works as a standalone novel, there are three books in the initial Raven's Mark series that will complete all of the story arcs for Galharrow and the other characters introduced in Blackwing. Ravencry will hit the shelves in summer 2018 (June for UK, August for US) and the third instalment, Crowfall, will follow in summer 2019. Crowfall is about 3/4 written as of now.

It's possible that I might get to add more books to the Raven's Mark series down the line but we'll have to wait and see whether that gets to happen. If I do then they will likely follow a different character in the same world.

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