[quote=@Polyphemus]
[@Lord Wraith] So I've been reading the character sheets and I'm just idly curious about one thing: if Batman is the "world's greatest detective" and Nightwing is third, who has the #2 slot? Elongated Man? 
[/quote]

Some would say that it's Tim. Ra's has called him detective before which is something he only referred to Batman as. And Batman even recognized that with time Tim could surpass him as the World's Greatest.