Bea is training hard to become a spy. Growing up in the Pangean Hotel, a secret sanctuary for spies, she spends her time studying self-defense, languages, codebreaking, and field medicine. And now she has extra lessons with her new mentor Ms. Halliday, not to mention a new babysitting job with her best friend Tommy.But when her friend Chantal sends her a telegram about a mean girl named Mabel (who is almost certainly part of an international league of Assassins), Bea knows she has to go undercover at Chantal’s school. Except the closer Bea gets to Mabel, the rockier her friendship with Chantal becomes. Bea knows she needs to take down the Arctic assassins... but she never thought that could mean losing a friend.