THE SMASH HIT NO.1 INTERNATIONAL BESTSELLER ~ A GUARDIAN and SUNDAY TIMES THRILLER OF THE MONTH ~ TV IN DEVELOPMENT WITH NETFLIX

Everyone knows the Anna O case.

Everyone knows it was Anna's fingerprints on the knife.

But no-one knows the secrets of her sleepwalking.

No-one knows whether she really meant to commit the murders that night.

As a trial nears, the mystery reawakens.

Is she innocent, or guilty?

For fans of Girl A and The Silent Patient, the story of ANNA O is your next obsession.

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READERS LOVE THE STORY OF ANNA O

⭐⭐⭐⭐⭐ ‘Best book of the year so far and will take some beating’

⭐⭐⭐⭐⭐ ‘Hooked me from the start and continues to haunt me. Brilliantly written and so many red herrings!’

⭐⭐⭐⭐⭐ ‘Absolutely riveting, I couldn't put it down’

⭐⭐⭐⭐⭐ ‘This was a rollercoaster read with some exciting twists and a killer ending’

⭐⭐⭐⭐⭐ ‘Addictive, brilliant and one I would definitely recommend’

⭐⭐⭐⭐⭐ ‘I loved this incredible fast-paced thriller’

⭐⭐⭐⭐⭐ ‘If you like The Silent Patient, this is the book for you.’

‘An irresistible concept beautifully executed’ LEE CHILD

‘The twist is one of the best I’ve read’ DAVID BALDACCI

‘Will keep you turning pages well past your bedtime’ NITA PROSE

‘The premise is original, the writing stylish, and the payoff unforgettable’ A J FINN

‘Extremely entertaining and terribly twisty’ CECELIA AHERN

‘A natural-born storyteller’ JEFFERY DEAVER

‘Utterly addictive, fiendishly clever’ LUCY CLARKE

‘Incredibly atmospheric’ RAGNAR JONASSON

‘As unsettling as a waking dream’ STIG ABELL

‘WHAT a ride. Everyone needs to read this book’ CRESSIDA MCLAUGHLIN

‘The smartest thriller I’ve read in years’ EMILIA HART

‘A plot that keeps you guessing’ STEPHANIE WROBEL

‘Will compel you to read it in one white-knuckled gulp’ C J COOKE

‘Ingeniously plotted and impossible to put down’ SARAH J HARRIS

'Will leave you thinking long after you're finished reading' SUN

'An intricate psychological thriller' THE BOOKSELLER

'One game-changing twist after another' PUBLISHERS WEEKLY

'Once you pick it up, there's no putting it down' KIRKUS

'The most talked about thriller of 2024' NBC's TODAY SHOW

'Brilliantly executed, packed with insight' DAILY MAIL

'Intriguing…A fascinating novel' MAIL ON SUNDAY

'A pacy thriller destined for the big screen' WOMAN & HOME

'Fresh and compelling…set to be a hit' ADELE PARKS FOR PLATINUM

After discovering that the average person spends thirty-three years of their life asleep, MATTHEW BLAKE felt the pull of a story. He began extensive research into sleep-related crimes and into the mystery illness known as resignation syndrome, research that sparked a thrilling question: if someone commits murder while sleepwalking, are they innocent or guilty? And so his novel Anna O was born.

Before writing fiction, Matthew worked as a researcher and speechwriter at the Palace of Westminster. He studied English at Durham University and Merton College, Oxford.