There's a small village of elves who have a magical gemstone that brings them great prosperity. But one day a group of fairies turn up claiming the stone originally belonged to them. Hundreds of years ago, the elves' ancestors stole it from them, and now they want it back. So what's the right thing to do? Who should get to keep the gem? Brains Trust – Westmead Public School, Sydney: Swetha, Reyansh, Anirudh, Reya, Kushagra, Ashvita