Jonas is selected to be the Receiver. He goes home and reads the rule for being the Receiver and it say he is allowed to lie, be rude. He also most receive answers to any question he asks. So He wonder if other people are allowed to lie and he is shocked be it. As it says in the book, "Jonas was stunned" it also said "What if others-adults-had, upon becoming Twelves, received in their instructions the same terrifying sentence". From now on Jonas would look at things from a different light.
Jonas, after many hardships he decides to go to elsewhere so the community would have to bare the painful memories the Giver and Jonas had to face. But there plain didn't work out, because Gabe was going to get released but Josa did want his dad to kill him so he ran away with Gabe. After running away the community sent planes to find them and the planes had heat-seeking devices to find them.