Robert Mckee, Steven Pressfield and Shawn Coyne have all worked together and have been successful in the editing/writing business for decades. All of them have great resources that refer to each other's work. And each man's work makes the others more clear and understandable.
These works are not for the faint of heart, however. I would recommend reading something by James Scott Bell or Larry Brooks before you delve into the 600 pages of Story by Robert McKee. But once you have the basics down pat, these works ease you into the minute details of writing unforgettable stories.
Story is long, but well laid out and every chapter gave me things to ponder about my own story.
The Story Grid gave me a way to assess my own work and to assess the qualities of master works that I can't get out of my head. Shawn Coyne seems genuinely interested in writers and very approachable with a great website and the best podcast for writers currently playing in my opinion. Because so many writers are financially strapped, he has even made his book free on the internet. (Though I bought my copy because I didn't feel I needed the man's charity.) I was so taken with his analysis, I am putting together a tool to help writers analyse their work and other works. I hope to have that to you next month sometime.
Steven Pressfield runs a blog for writers with great articles.
Hope you get the time to check out one or all of these resources.