On Anna Maria Island, Florida, with her mother and younger sister, Lanie, for the summer vacation, twelve-year old Olivia is upset by her parents' divorce, especially as she has always been closest to her father who is not with them this year; she plans to lie low and nurse her hurt and anger--until she learns that the local population of sea turtles is threatened by her neighbor's beach house, and realizes that she has to do something about it.