Hallie was the big sister, the mountain that protected them from the ravages of the world. If Hallie had been in that submersible with Heather, Heather would have survived. If Hallie were here, she’d know exactly what to do. Hallie could be bossy and annoying and I-know-best in the way of big sisters and hearing people combined, but she was also a superhero, and superheroes always knew what to do.)
