Shell

12 year old surfer girl Sam Torres feels estranged from her best friend Jade Lee, who has joined a science camp and has tired of Sam's "immature" games. So when Sam insists she has found a hidden undersea cavern and is being following by a mysterious ghost, Jade is merely exasperated -- until she meets Santi, the dead ghost boy from a sunken pirate ship who needs the girls' help to avert a looming catastrophe.