Just in time for Valentine's Day, Sophie's found the sweetest name of all! Sophie has tried being awesome, heroic, a chatterbox, a zillionaire, a snoop, and a daredevil, but none of her names have stuck. Until now! Love is in the air-so what better name for Sophie to try out than Sophie the Sweetheart? But a mystery note and a run-in with her ex-best friend (and major nemesis), Toby, might make it hard for Sophie to stay super sweet.