There are 4 books in the The Mysterious Benedict Society series. The newest book is The Mysterious Benedict Society and the Riddle of Ages which came out in 2019.

1
The Mysterious Benedict Society

By Trenton Lee Stewart , Carson Ellis (illustrator) ,

Book cover of The Mysterious Benedict Society
"Are you a gifted child looking for special opportunities?"When this peculiar ad appears in the newspaper, dozens of children enroll to take a series of mysterious, mind-bending tests. (And you, dear reader, can test your wits right alongside them.) But in the end just four very special children will succeed.…
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2
The Mysterious Benedict Society and the Perilous Journey

By Trenton Lee Stewart , Diana Sudyka (illustrator) ,

Book cover of The Mysterious Benedict Society and the Perilous Journey
Book 2 in the New York Times bestselling series,
now a TV series on Disney+!
'This book reminded me of some of the children's books
I grew up with, like Charlie and the Chocolate Factory and The
Phantom Tollbooth.' RICK
RIORDAN, author of the PERCY JACKSON series
on book 1…

3
The Mysterious Benedict Society and the Prisoner's Dilemma

By Trenton Lee Stewart , Diana Sudyka (illustrator) ,

Book cover of The Mysterious Benedict Society and the Prisoner's Dilemma
Join the Mysterious Benedict Society as Reynie, Kate, Sticky, and Constance embark on a daring new adventure that threatens to force them apart from their families, friends, and even each other. When an unexplained blackout engulfs Stonetown, the foursome must unravel clues relating to a nefarious new plot, while their…

4
The Mysterious Benedict Society and the Riddle of Ages

By Trenton Lee Stewart , Manu Montoya (illustrator),

Book cover of The Mysterious Benedict Society and the Riddle of Ages
Book 4 in the New York Times bestselling series,
now a TV series on Disney+!
'This book reminded me of some of the children's books
I grew up with, like Charlie and the Chocolate Factory and The
Phantom Tollbooth.' RICK
RIORDAN, author of the PERCY JACKSON series
on book 1…