The Stone of Excellent Luck

Saving the world just got tricky Ray knows he has to save the world this coming summer, since he's supposed to be "The Shining One." But then the mysterious new bully in town, Finn, tells Ray that he's the true one of the prophecies, not Ray. Finn has taken the Stone of Excellent Luck from the deadly caverns underneath the town, the first magical artifact needed to stop the Awful Solstice.
Finn is now after the great sword Excalibur, and once he's got it, he's going to be unstoppable. Worst of all, Finn doesn't want to save the world. He wants to see everything fall apart! Ray and Clancy must brave the deadly traps in the caverns, find Excalibur first, and convince Finn to play a desperate game of winner-takes-all. Their adventure takes them to the windswept moors of Scotland, the oceans of the Caribbean, and a final confrontation that will give them a way to save the world, or lose their chance forever.