My Story, part 4

Oh, no. Not good.
"Okay, Meggie, print out as much as you can, write down the password, Nick, grab the laptop. Everybody else, barricade the door." I shouted, shoving a spinney chair in front of the it. In five minuets , the door was barred so heavily that even if the Ratters had laser guns they probably couldn't get through. Probably.
"We're ready" said Nick "let's scram."
Scram we did. Rose pushed open the sky blue side door and we ran outside.
"Up the tree, then jet packs on, then to Guano land. Got it?"
Guano land was our secret hideout. we shared it with, yep, bats. and their smelly...stuff.
So anyway, we got safely there with our homemade jet packs, and now we had to do some house hunting. what bugged me, though, was the question of how did the ratters find us??