Purple Opal
This is the third book in the Gemstone Girls series, featuring the adventures of Ruby and Scarlett.
Ruby Halliday and Scarlett Jones travel from their school for a holiday in Australia, where they learn about opals and discover an underground town. A mysterious disease which makes people glow in ultra-violet light sweeps the world, and its cure rests in the golden books discovered in South America by Scarlett’s parents.
The four travel to South America, where they meet a shaman and Potch the Pixie – and a talking panther who mysteriously resembles the cat from the first book. Ruby, Scarlett, and Scarlett’s mother Angela frantically search for a purple opal - which no longer exists. The jewel is needed as part of the cure for the strange disease, so the girls use magic to create it, and also have to find carambola juice to complete the cure.
They are unaware that they are being watched by an old enemy who is bitterly determined to take revenge upon Scarlett by stealing the newly-created opal.
Will the girls recover the purple opal in time to create a cure?