The last of seven brand new 39 Clues stories, with an explosive secret revealed!

The holidays can be hard for any family, but they're particularly tough for the Cahills. Amy Cahill is exhausted from her training. Dan can't forget the tragedies he witnessed on the Clue hunt. Ian and Natalie Kabra are trying to enjoy the London festivities, but it's hard without their parents. Even superstar Jonah Wizard is having trouble getting into the holiday spirit. Amy knows there's danger on the horizon, but there's no reason they shouldn't enjoy themselves while they can. Taking advantage of their new fortune, Amy and Dan book a private plane and jet off to fetch the other Cahills for a New Years none of them will ever forget.