After passing a series of mind-bending tests, four children are selected for a secret mission that requires them to go undercover at the Learning Institute for the Very Enlightened, where the only rule is that there are no rules.

Reynie, Kate, Sticky, and Constance, all graduates of the Learning Institute for the Very Enlightened and members of the Benedict Society, embark on a scavenger hunt that turns into a desperate search for the missing Mr. Benedict.

"When twelve-year-old Reuben finds a peculiar, magical watch that has the power to turn its wearer invisible, he's propelled on the adventure of a lifetime"-- When Reuben discovers an antique watch that was mortared into the wall, he soon learns it has a secret power. As one secret leads to another, Reuben finds himself torn between his innately honest nature and the lure to be a hero. Now he is on a dangerous adventure, and with fearless Penny,...

"After starring in three adventures, the inimitable quartet of Reynie, Sticky, Kate, and Constance haven't had a mission together in some time. But with the arrival of a new Society member--and a new threat--they must reunite to face dilemmas more dangerous than ever before, including the return of the villainous Mr. Curtain and his Ten Men and a formidable enemy with a mystifying ability to track their every move." --

Reynie, Kate, Sticky, and Constance, all graduates of the Learning Institute for the Very Enlightened and members of the Benedict Society, embark on a scavenger hunt that turns into a desperate search for the missing Mr. Benedict.