If you're a superhero comic book fan, particularly of the Batman/Bat-family variety, you NEED to be reading the Rebirth Detective Comics.
940 is a total "wtf, didn't see that coming! Wait, now Rebirth makes sense!!" issue. I thought Titans, Batman and The Flash were going to be the ones following the trail of breadcrumbs left in the Rebirth special, but Detective Comics (and Action Comics & Superman) seem to be the ones going that route.
Detective is THE Batman book again, like it was in the 'good old days'.
Grab the trade if you've not been following it, you'll not regret it.