What is the climax in found by Margaret Peterson?

Well, honey, in "Found" by Margaret Peterson Haddix, the climax is when Jonah and Chip discover the truth about their origins and realize they are actually missing children from history. It's a real "aha" moment that changes the whole game for these two boys. Trust me, it's a real nail-biter that will have you flipping those pages faster than you can say "plot twist."