Get on the case with the best kids' detective club in town! Minerva Keen and co are ready to take on a hair-raising new lead. But when know-it-all Zoe joins the club to read mysteries instead of solving them, it seems their sleuthing days might be over. To make things worse, Minerva's favorite teacher, Ms Voyant, takes Zoe's side . . . which gets Minerva wondering what secrets they could be hiding. As she digs into one puzzle, new questions pop up. Such as: Why are Ms Voyant and Zoe so friendly? And where do Minerva's parents go on their mysterious 'business trips'? Minerva and her friends are divided over which mystery to untangle first. And without their greatest strength - each other - will this detective club be in over its head?