Charlie's Story - Charlie's Story, #1

Fourteen-year-old Samantha spends her days exploring the shallow reef behind her island home. With her world locked in a battle against rising seas, scientists deploy genetically modified corals to rebuild reefs and protect the coastline. No one expects the reefs to be a hotbed of evolution, but they are. When an octopus flows off a rock in her lagoon, Samantha is startled. When he purposefully arranges pieces of coral on the sand, trying to communicate, she is shocked.
How she responds may determine the fate of life on Earth.