Good grief! What has happened to the Great Barrier Reef? Did you know the coral colours are a warning sign? A global reef alarm? We all need to do what we can to keep it safe from harm.' One day Anthia's home on the Great Barrier Reef starts getting hot, VERY hot. Soon all the colour starts disappearing from the Reef! Join Anthia and her sea creature friends as they find the Great Barrier THIEF and bring the colours back to their underwater home.