Re: DC's New 52: Reviews and Discussion (Spoilers welcolme and likely)
The main bits take place in "Batman" (I just ordered the second volume which came out a couple weeks ago) and the other Bat-Family parts are collected in "Batman: The Night of Owls" (which is also available in trade) which is the main month long arc. You have no trouble following what's going on if you just get "Batman" though which is what I ended up doing after dropping a couple of the other books around that time.
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Ignoring the The Last Stand since 2011.