THERE WAS A SINGLE sharp drum beat followed by a fanfare of trumpets—which always reminded Carina of the opening credits to that old show, The Love Boat—as the huge spiral waterslide was activated (marking the beginning of the YMCA’s After-school All-swim), and she launched herself into the sluice. The loudspeakers blared: Young man, there’s no need to feel down / I said, young man, pick yourself off the ground ... And then she was sliding and careening down, a little faster than she would have liked, wondering if she would crash headlong into Alex before she even reached the bottom—a thought that was dispelled as she plunged into the four feet of water at the base of the slide ... and surfaced, gasping and disoriented. “Boo,” said Alex, startling her from behind, and laughed. “Oh ...