Double Cross

In the third installment of the Mrs. Smith's Spy School for Girls series, Abby and her classmates participate in the exciting Challenge at Briar Academy, a high-stakes prep-school competition. As they navigate the event, they uncover that the Ghost is using the school as a base for a sinister plan involving a new invention, leading Abby to suspect treachery from within. With the stakes higher than ever, trust becomes a precious and fragile commodity.