Just as Martine is settling into life on the wildlife game reserve, she is whisked away on a school trip. She must leave her white giraffe, Jemmy, for two weeks! Her class is going on an ocean voyage to witness the Sardine Run, a spectacular natural phenomenon, off the coast of South Africa. What begins as an exciting adventure quickly turns perilous when a storm blows up and Martine and her classmates are thrown overboard into shark-infested waters. They are saved by a pod of dolphins, only to end up marooned on a deserted island. The castaways, at odds with one another, must figure out not only how to survive, but how to help the dolphins when a terrible danger threatens them. In a gripping tale of courage, friendship, and survival, Martine must use her healing gift and her wilderness training to save both humans and animals alike.