Seaside Sanctuary is supposed to be a safe place for marine animals, but suddenly dolphins are getting sick-and no one can explain why. Since Elsa Roth spends all of her time at the sanctuary, a perk of her parents' jobs there, she's well acquainted with all the animals. Elsa is especially worried about Star, a young dolphin she bonded with after seeing him in his wild pen. When the crisis intensifies, it's up to Elsa to get to solve the mystery before...