
⭐⭐⭐⭐⭐ “Like reading a diary of my parenting life.”
Written by Ethan Knight at 18, The PDA Effect shares his experiences of growing up with PDA — from education and everyday demands to friendships, communication and becoming more independent.
A personal account. Ethan’s experiences. His words.
Ethan didn't learn to read until he was ten years old. At eighteen, he published his first book.
Amazon UK & Australia #1 Bestseller

The PDA Effect is Ethan Knight's first-person account of growing up with Pathological Demand Avoidance (PDA).
Drawing on his own experiences, Ethan writes about everyday demands, education, communication, friendships, decision-making and finding ways to communicate what he needs.
This is a personal account based on Ethan's lived experience, not medical or clinical advice.
Editions
"Great insights about living with PDA and ways to help"
Loved this book, easy to read and so much I could relate to in terms of how I think our PDAer experiences life. I highly recommend this and think it would be great for anyone trying to understand themselves or the PDA profile - the writing is clear and not too wordy, meaning it could be good for younger tweens and teens, and for siblings of PDAers.
Steph Curtis (Author of PDA in the Family)
"A Masterclass"
Brian, Autism Support Community

eBook
£4.95
All profits go to the author.
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Signed Paperback
£8.95
Bundle deals available when you add more books to cart.
All profits go to the author
Ships from the UK

Signed Large Print
£9.95
Ideal for readers who prefer larger, clearer text.
All profits go to the author
Bundle deals available when you add more books to cart.
Ships from the UK

Written by Ethan's older brother, Callum Knight, at just 16 years old, this Amazon #1 bestseller is a memoir of growing up with a different way of seeing the world.
11+
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ISBN (Paperback): 978-1917514170
Page count: 113
Publication date: May 2025
This book is available at the British Library
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