Ruby the Red Fairy (Rainbow Magic, #1)

When Rachel and Kirsty arrive at Rainspell Island for vacation, they have no idea what kind of magical adventure awaits! The seven Rainbow Fairies have been banished from Fairyland by the wicked Jack Frost. If they don't return soon, Fairyland is doomed to be colorless and gray.
In the pot at the end of the rainbow, Rachel and Kirsty come across Ruby the Red Fairy. Can they keep her safe and find the rest of her Rainbow sisters... before it's too late?