When Robin and Zo-Zo discover that their beloved lake has become a toxic sludge, they know they have to do something to fix it. But trouble begins when the two friends develop a crush on the same boy during a community meeting to save the lake. To save the girl's friendship, Robin's grandmother suggests a high-seas adventure with a whale-saving friend of hers and Robin must decide what is more important: a relationship with a boy or saving the animals she loves.