There are 4 books in the The One and Only series. The newest book is The One and Only Family which came out in 2024.

1
The One and Only Ivan

By Katherine Applegate , Patricia Castelao (illustrator) ,

Book cover of The One and Only Ivan

Now a major motion picture available on Disney+!

Inspired by a true story, this is the beautifully written tale of how a mighty gorilla wins his freedom. A winning blend of humour and poignancy that will appeal to fans of Michael Morpurgo.

This #1 New York Times bestselling and Newbery…

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2
The One and Only Bob

By Katherine Applegate , Patricia Castelao (illustrator) ,

Book cover of The One and Only Bob

The One and Only Ivan is now a major motion picture available on Disney+!

Return to the unforgettable world of the Newbery Medal-winning and #1 New York Times bestselling novel The One and Only Ivan in this incredible sequel, starring Ivan's friend Bob!

Bob sets out on a dangerous journey…

3
The One and Only Ruby

By Katherine Applegate , Patricia Castelao (illustrator) ,

Book cover of The One and Only Ruby

From beloved powerhouse author Katherine Applegate comes The One and Only Ruby, starring the adorable baby elephant from the Newbery Medal-winning modern classic The One and Only Ivan and its bestselling sequel, The One and Only Bob.

Ruby's story picks up a few months after the events of The One…

4
The One and Only Family

Book cover of The One and Only Family

From beloved author Katherine Applegate comes The One and Only Family, the final instalment in the series that began with the Newbery Medal-winning, #1 New York Times bestselling modern classic The One and Only Ivan and its sequels, The One and Only Bob and The One and Only Ruby.

Ivan…