There are 3 books in the Once Series series. The newest book is Now which came out in 2010.

1
Once

Book cover of Once

My name is Felix. This is my story.

Felix has been living in an orphanage for three years and eight months when the men in armbands arrive to burn the books.

Going on the run in search of his parents, Felix soon learns that Poland in 1942 is not a…

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2
Then

Book cover of Then

Felix and Zelda have escaped the death camp train, but where do they go now? They're two runaway kids in Nazi-occupied Poland during World War II and the Holocaust. Danger lies at every turn of the road.

With the help of a woman named Genia and their active imaginations, Felix…

3
Now

Book cover of Now

Now is the sixth shocking, funny and heartbreaking book in Morris Gleitzman's Second World War series.

Sometimes facing the past is the bravest act of all...

ONCE
I didn't know about my grandfather Felix's scary childhood.

THEN
I found out what the Nazis did to his best friend Zelda.

NOW…