Arthur lives in an old mansion steeped in rumors of hidden treasure, and he plans to be the one who finally finds it. But it seems he’s not the only one. When sneaky magician thieves show up, Arthur is launched into an adventure with Transportal doors, odd powers, and magical creatures. He finally sees his chance to be a hero—if only he can survive a traitor’s cunning plot.

The Spyglass Squad is back at Historia, and an exciting year is waiting for them. This time twelve-year-old Arthur Grey is kept busy discovering the real legends and artifacts behind ancient myths. But the most exciting experience is thrilling olympic games this year. That is, until new mysteries start cropping up. Strange rumors surface on the island of Crete, and a spiteful investor shows up pretending to have help for Historia. Even as it becomes more obvious that the Historia Society is the target of a villainous plot, everyone is too afraid to do anything about it. Now, Arthur and his friends dig themselves into monstrous trouble while trying to save Historia, and they can't solve this riddle alone. But who can-or will-help?