* "Gives readers a reason to fall in love with the series all over again...[with] adventures, danger, cleverness, dry wit, and good-hearted characters at the center of the action."—Booklist, starred review
—The Horn Book
"Stewart balances the elements of his story beautifully, using the mystery puzzle to drive the plot while heightening tension through encounters with the Spiders and deepening the tenderness by following Nicholas's emotional development...[as] Mysterious Benedict Society fans have come to expect (and love) from master storyteller Stewart."
"Stewart fills in the back story on the narcoleptic genius founder of the Mysterious Benedict Society...[with]...admirable insight."—Kirkus Reviews
"Fans will be thrilled with the rich backstory of a beloved character."—School Library Journal