Justice League by Christopher Priest (The Deluxe Edition)

In this new hardcover, the Justice League is confronted by three concurrent threats as a sleep-deprived Batman makes a crucial error that causes an unthinkable - and potentially unforgivable - tragedy. As if that weren't enough, the combined Justice League and Justice League of America teams clash over leadership while the Green Lanterns face making critical choices that will affect their teams forever!

Collects Justice League #34-43.