Ahhaaa :) That's a pretty good question, actually.Weell, i gueess, of course... all thiefs are friends. :P But what will really happen is, they'll saayaa.. gaassshhh, why the helldid you steal maa...
From the Cary Grant film (1955) and the Robert Wagner TV series (1968), the theme is "it takes a thief to catch a thief".The original proverb is "set a thief to catch a thief".