New York Times bestseller! From Matt and Rebecca Zamolo, creators of the mega-popular YouTube series Game Master Network, comes a new thrilling novel about everyone's favorite mystery-solving team as they go toe-to-toe with the mysterious and menacing Game Master. Rebecca Zamolo is on a mission to save her summer. Instead of going to camp like she'd planned, she's been stuck in summer school. But today is the day! She's going to present her final science assignment-using her Nana's borrowed vintage zoetrope-and then she'll be free to have fun.