You can focus on one target or move around to scan the surface thoughts of all targets within 30 feet.  However, not all enemies, bad guys, or guards will have the information that the party requires. While some may be thinking about dinner and others about their sweetheart back at home, others might be thinking of the clouds or thinking about dinner. This is a great way to show your mooks and NPCs that you are not scheming. It can also be a fun way for them to see that they are not all in on the Big Bad Evil Guy and Girl's plans. They might be happy living a simple lifestyle and enjoying it. Even if your enemy is knowledgeable, they might think, "Hah! I'm not telling him where the bosses are, because he'd murder me!" This could create a greater challenge for your spellcaster and force them to dig deeper into their enemy's head.