"Bo-oys." Cleo's voice rang clear through the open door. "Some people are here, so please be quiet." 

This obviously got Scar's attention. Who? 

"Who?" asked Bdubs. Clearly he wasn't as subtle as Scar. 

"No-one.... yeah" Scar was very interested now. "Please stay away. They are... well... dangerous. Rebellious. Rougish."

"What? Oh yes, C-come in, Grian. I was just saying something to the kids."

"I need to tell you something." one of them whispered. Scar could not see them, but from what he could hear, they didn't sound 'roguish' like Cleo had said. They just sounded normal. A different accent, maybe, but that was it. 

"We need to tell you something. About ties." 

"Ties?" whispered Bdubs to car. Scar didn't know what it meant either, so he made a shush motion with his finger and carried on, his ear pressed to the door. 

"WE need to talk somewhere quiet. Maybe your storage?" A second voice came from the hall. Bdubs gestured triumphantly to Scar- there may or may not have been a secret passage leading alongside the storage that their mum didn't know about. (yes I am British ) "Y-yes. Of course." Cleo stuttered. Scar frowned. Was his mum scared? But Cleo wasn't scared of anything! But it seemed she was scared of these people.  He heard footsteps coming down the corridor and echoing down stone steps. Bdubs opened a hidden trap door for Scar and then got in himself. A narrow, gloomy staircase descended down into the blackness; Scar stopped about halfway down, then paused. A third voice spoke. 

"You know the box."

"Yes? Cleo replied, not sounding as terrified. It seemed the person she was most scared of was 'Grian,' who Scar guessed was the first voice. 

"We know what it is." said the second voice, still quiet. 

"A mob farm. Specifically... " Grian, trailing off at the end. 

"For creepers. And creepers drop..." Third voice.

"Gunpowder. And that can be used to craft..." 

"TNT" finished Cleo, sounding very scared and worried. 

Bdubs turned and whispered to Scar. "What's TNT?" Scar shrugged, then pressed his ear to the wall again. 

"Well, that was all. "

"Unless..." whispered the second voice.

"Joel!" scolded Grian. "We agreed we wouldn't ask Cleo! She has kids!" (in case anybody wondered what it actually was, they were asking her to talk to etho.)

"Hang on.. speaking of the kids, where are they? WE haven't seen them. Ever. "

"And they're our cousins, Aunt Cleo. "

Sorry I can't cliffhanger!