Another great book from Margaret Peterson Haddix -- a series opener that will booktalk itself! Imagine you are new airline employee Angela, and you see something you are told never to speak of again: a plane appears at a gate as if from nowhere, and on board there are no adults -- but each of the 36 seats contains a baby. Fast-forward to present day, and teen protagonist Jonah gets an anonymous letter that says "You are one of the missing," and then another that says "Beware! They're coming back for you." Why is this happening...and what does it have to do with the plane? I won't give away any plot twists, but this is an action-packed book that will leave readers hanging off a cliff at the end! 
 Extra points for Jonah's spunky, sarcastic younger sister. She may not be the main character, but she sure doesn't let herself be left on the sidelines!