Marena Montoya is learning how marine mammals talk to each other. But her bigger challenge is learning how to communicate with her new study partner, Samuel, as sea mammal rescues – and their own lives – will depend on it. A baby sea otter and a dolphin need Marena and Samuel’s help, but when the team investigates strange sounds under the ocean, they become the ones in need of rescue. Trapped and in trouble, can Marena and Samuel escape on their own? Or will they need a little help from a sea mammal friend?