The news of her mother's death hits Nell as if she's been shot. The letter must be some kind of prank, but who could be so cruel? Because Nell's mother died nearly thirty years ago.

When Nell was just a tiny baby, her parents died in a car crash, leaving her to be raised by her devoted grandmother, Lilian. So when the lawyer's letter arrives, informing her of her mother Sarah's very recent death, it destroys everything Nell thought she knew. Her grandmother loved her, so why did she lie? And why did her mother abandon her?

Nell knows she can never recapture the years with her mother that were taken from her, and fears this will haunt her forever. Now she won't rest until she finds out why she was so cruelly deceived. But her family's past has been kept secret for a reason, and someone is desperate for it to stay that way. How much danger will Nell risk for the truth?

If you loved The Silent Patient, The Secret Mother, and The Wife Between Us, then this addictive thriller about dark family secrets and obsession will have you on the edge of your seat.

Readers are loving I Know You Lied:

'Wow oh wow, what an amazing thriller. This one has you holding your breath the whole time, thrilling, chilling and hard to put down. Had me on a rollercoaster of a ride and I didn't want it to stop.' Goodreads reviewer, 5 stars

'My heart was beating so fast!... Every page, every chapter was a page turner... It was just perfect!... What a Rollercoaster!... Like OMG!' Goodreads reviewer, 5 stars

'[An] absolutely fantastic read... I have devoured this book in just one sitting.' Little Miss Book Lover 87, 5 stars

'What an absolute corker of a thriller! I was blown away... Jammed to the rafters with twists, turns, betrayal, family lies, jealousy, deception, manipulation and pure evil!... I was completely gripped from start to finish.' Bookreviewercakemaker, 5 stars

'[I was] glued to the pages... I loved this book!' B for Bookreview, 5 stars

'I couldn't put this book down for a second... such a great story... loved all the twists turns and suspense which kept me gripped to the very end... so amazing.' Goodreads reviewer, 5 stars

'A well-written, twisty novel. Another fantastic and compelling thriller by Sanderson.' The Bandwagon, 5 stars

'An excellent mystery... kept me glued to the pages. I can't recommend the book enough!' Goodreads reviewer, 5 stars

'Had me captivated since the first page... [It keeps] you guessing with surprise after surprise... one of my top read books this year.' Goodreads reviewer, 5 stars

'What an intriguing story this is!... Loved it!' Rona Halsall, 5 stars