Eddie Redmayne: “Before I was cast in the film, David Yates told me about Newt and this textbook. I found it so funny and so enchanting and really wittily written. But it wasn’t until I started reading it out loud for the audiobook that I realized how tricky and poetic J.K. Rowling’s use of sounds and language can be.

“There are some really great tongue twister words in here! Occasionally, I had to stop recording just because I was incapable of saying the words without either laughing or getting my tongue in a muddle. I enjoyed the challenge and hope listeners can sense that in my narration.”