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Ethan is a 19-year-old author who brings a rare and heartfelt perspective to the topic of Pathological Demand Avoidance (PDA) in his debut book, written when he was just 18.
Struggling with learning and speech difficulties in early childhood, Ethan was unable to read until the age of ten. His journey to becoming an author has been shaped by perseverance, resilience, and a deep commitment to sharing his lived experience.
Having overcome challenges that once made everyday communication difficult, Ethan has written a book that offers genuine insight into the realities of life with PDA. Through his words, he aims to help others better understand the unique struggles and strengths of people like him.
Ethan’s story is a powerful reminder that with determination, even the steepest obstacles can be transformed into opportunities to create change and foster understanding.
Amazon UK #1 Bestseller in Children's Autism Spectrum & Educational Strategies & Policies.
Amazon Australia reached #1 Best Seller in Biographies of People with Disabilities

Pathological Demand Avoidance (PDA) is one of the most misunderstood profiles on the autism spectrum—but this book changes that. Written by 18-year-old Ethan Knight, The PDA Effect offers an honest, first-person guide to living with PDA, sharing what really helps—from decision-making and daily routines to friendships and self-advocacy.
Large Print reduces eye strain and supports focus—ideal for dyslexia, visual impairments, or younger readers.

"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 c
"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. It would also be great for explaining PDA to extended family and friends. Maybe even busy educators and health professionals could find time to squeeze it into their day.
— Steph Curtis (Author of PDA in the Family)
"A Masterclass in PDA and Autism"
— Brian, Autism Support Community

📚 Special Bundle Offer – Save 20%!
Buy The Secrets of My Spectrum and The PDA Effect together and enjoy an automatic 20% discount at checkout!
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Signed Standard Paperback
£8.75
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Signed (Large Print) Paperback
£9.99
Easier to Read for People with Visual Stress or Eye Conditions
Neurodivergent-Friendly
More Comfortable for Long Reading Sessions
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eBook £4.95
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Standard Hardback edition from
The Great British Bookshop
🌱 Eco-friendly – Each book is printed to order, especially for you.
🤝 Direct from publishers – Books come straight from the source, supporting authors directly.
£12.99

Standard Paperback edition from
The Great British Bookshop
🌱 Eco-friendly – Each book is printed to order, especially for you.
🤝 Direct from publishers – Books come straight from the source, supporting authors directly.
£8.75
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