"You don't?" she asked in surprise. It wasn't even about having them here with her so much as knowing if they were here at all. "At least then you'd know for sure and you wouldn't have to keep waiting around here."
She nodded solemnly at his next remark, she'd been wondering the same thing. "Maybe there was a switch or maybe she, um-" Cassie stopped herself and shook her head (Billy didn't need the idea of maybe having killed the other Kate on his conscience, too) "A switch seems pretty logical."