The kids are back on Earth with Mr. Murry. Group hug in the garden. Everything's hunky-dory, right? Well, not so fast. Mr. Murry and Calvin Wallace both escaped from IT, but the giant brain dude is still pulsating out there on Camazotz, and most of the people of that planet probably didn't even know that the Murrys were poking at their collective brain. The ending of the novel is definitely happy. But from another perspective, the more universal perspective that the novel itself cultivates, that happiness is very limited. There's also the little matter of Mrs. Whatsit, Mrs. Who, and Mrs. Which, carried off in midsentence: something tells us those weird ladies will be back, and not just because we saw the page at the beginning of the book listing the sequels.