While participating in The Challenge at Briar Academy, Abby and friends learn that their nemesis is using Briar as headquarters for planning an attack, and that The Ghost has inside help.

Beth McMullen is the author of the Mrs. Smith’s Spy School for Girls series; the Lola Benko, Treasure Hunter series; the Secret of the Storm series; and several adult mysteries. Her books have heroes and bad guys, action and messy situations. An avid reader, she once missed her subway stop and rode the train all the way to Brooklyn because the book she was reading was that good. She lives in northern California with her family and two cats. Visit her at BethMcMullenBooks.com.