DC doesn't provide a legal digital option for reading their stuff. Sorry.
As for summaries not doing the story justice, that's not the point. The point is that you can get by reading Battle for the Cowl just fine if you have a general idea of the premise, which I already explained.
But if you're really interested in reading it all, go back to the beginning of Grant Morrison's run on Batman, starting with issue #655 and read from there. It'll give you everything you need to know about the Club of Heroes, the Club of Villains, the Black Glove, William Hurt, Damien Wayne, and the Replacement Batmen. Get Paul Dini's 5-part Heart of Hush storyline, starting in Detective Comics #846. Read Final Crisis as well. And to understand Final Crisis you're probably going to have to read some JLA issues that lead into that and all of Grant Morrison's Seven Soldiers mini-series. Oh and reading Ininite Crisis can't hurt either, because that sets up Final Crisis, in a way. And in order to understand Infinite Crisis, you should probably read all the mini series that lead into that...
Do you understand what I'm getting at, dude? Yes, reading the original story is the best way to get what you need, but once you read one, you have to keep going back to read more and more to get an even fuller story. Comics are a serial medium; they're always building on what came before. Eventually you just have to say "screw it" and do a quick skim of a couple of wiki articles.
But hey, if you're willing to read all that (and much, much more), more power to you.