Avery Kylie Grambs just has to survive a few more weeks living in Hawthorne House, and she'll inherit billions and become the richest teenager on the planet. But when a visitor arrives at the house, Avery knows there's still one more puzzle to solve. Avery and the Hawthorne brothers soon find themselves in a race against the clock to crack Tobias Hawthorne's final code, one that has potentially deadly consequences.