It's Lark's seventeenth birthday, and although she's hated to be reminded of the day ever since her mom's death three years ago, it's off to a great start. Lark has written a killer song to perform with her band, the weather is stunning and she's got a date with gorgeous Alec. The two take a canoe out on the lake, and everything is perfect until Lark hears the screams. Annabelle, a little girl she used to babysit, is drowning in the nearby reeds while Annabelle's mom tries desperately to reach her. Lark and Alec are closer, and they both dive in. But Alec hits his head on a rock in the water and begins to flail. Alec and Annabelle are drowning. And Lark can save only one of them.