Green Lantern: Emerald Warriors #13
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Even if Batman and Guy aren't the same characters they were during Keith Giffen's glorious run the pair work well together (though it certainly helps if you were a fan of Giffen's League). The mystery itself isn't explored very well (Batman solves the case off-panel while Guy grills the suspects), and, as I've already stated, the comic ends with a panel that (with all the subtetly of a Michael Bay action flick) directly references one of the most memorable moments from JLI.
Since it's creation this comic has been hit-and-miss for me from month to month. The last issue works well-enough (even if its somewhat hamfisted), but if you don't have nostalgia for JLI I'm not sure the story is going to hold up on its own. Hit-and-Miss.
[DC, $2.99]