Discover the No.1 Sunday Times bestselling crime thriller that will keep you hooked to the very end.

*A NO.1 SUNDAY TIMES BESTSELLER*
*A RICHARD AND JUDY BOOKCLUB PICK*
*SHORTLISTED FOR CRIME NOVEL OF THE YEAR, IRISH INDEPENDENT*

'Impossible to put down'. Chris Whitaker
'Andrea Mara is a star.' Lee Child
'Probably the most suspenseful book I will read all year.' Liz Nugent

Two children get on the train. Only one gets off...

No one saw it happen.
Your two little girls jump on the train ahead of you. As you try to join them, the doors slide shut and the train moves away, leaving you behind.

Everyone is lying.
It's only when you reach the next stop that you truly begin to panic. Because there aren't two children waiting for you on the platform. There's only one.

Someone is to blame.
Has your other daughter got lost? Been taken by a passing stranger?
Or perhaps the culprit is closer to home than you think…

Don't miss Andrea Mara's unputdownable new novel, Such a Nice Girl - available to pre-order now!

Everyone is talking about No One Saw a Thing:

'I was hooked by the end of chapter one.' Jane Casey

One of the most tense thrillers of the year so far.' John Marrs

'Twisting, frightening and impossible to put down.' Chris Whitaker

'I devoured it.' Fiona Cummins

'You will look hard to find a more searing opening 15 pages of a thriller this year.' Irish Independent

'This sharply observed novel manages to be at once an intricate puzzle and an involving race against time' The Sunday Times

'A roller coaster ride of a read where the twists are relentless right up until the very end. Brilliantly done!' * * * * * Reader review

'A fast-paced, gripping thriller that I devoured in one sitting' * * * * * Reader review

'Wow! Best book I've read in 2023 so far. . .I'll absolutely be reading more of Andrea Mara's books because this was BRILLIANT!' * * * * * Reader review

'This is in my opinion Andrea Mara's best book so far. She just keeps getting better and better. There's so many twists that even the twists have twists!' * * * * * Reader review

'I lost sleep not wanting to put this book down. Lots of plot twists and enough turns to keep you on the edge of your seat. Would highly recommend!' * * * * * Reader review

Number 1 Sunday Times bestseller, February 2024
Richard and Judy Book Club pick, February 2024
Shortlisted for the Irish Independent Crime Novel of the Year, 2023

'The pace never flags, the tension racks up and the pages turn themselves. Probably the most suspenseful book I will read all year.' * Liz Nugent *
'Andrea Mara has a gift for turning 'what if' into 'uh-oh' - No One Saw a Thing is a fantastic example of her compelling plotting. I was hooked by the end of chapter one.' * Jane Casey *
'Utterly gripping... You will look hard to find a more searing opening 15 pages of a thriller this year... A sure-fire winner from start to finish.' * Irish Independent *
'Such a clever page-turner, drawing on every parent's darkest fears' * Cara Hunter *
'This sharply observed novel manages to be at once an intricate puzzle and an involving race against time' * The Sunday Times *
I loved No One Saw a Thing by Andrea Mara - which saw me deciding I knew what was happening every 5 minutes and realising I was wrong 5 minutes later. So clever. Tense, twisty, turny. * Jennie Godfrey *
'As soon as I started reading this, I had no choice but to continue reading until the last page. I DEVOURED it. Such a tense, thrilling ride of a novel that played into my darkest fears and captured the emotions of panicked parents so evocatively.' * Fiona Cummins *
'I dare, nay defy, you to try and put this thriller down!' * Red Magazine *
'Twisting, frightening and impossible to put down. No One Saw A Thing is Andrea Mara at her nerve-shredding best. I loved it.' * Chris Whitaker *
'From the first chapter of this Andrea Mara novel, I had shivers. Twisty, clever, impossible to put down.' * Louise O'Neill *

Andrea Mara is a number one Sunday Times, Irish Times and Kindle bestselling author, whose books have sold more than one million copies across all formats. The TV adaptation of her 2021 book, All Her Fault, aired in November 2025 to huge critical and audience acclaim, with Sarah Snook (Succession) playing the lead. It became the most-watched TV show in America during the first week of its release. Her most recent novel, It Should Have Been You, won Irish Crime Novel of the Year at the 2025 An Post Book Awards. It was a No.1 bestseller in Ireland for six weeks, and a Top Ten Sunday Times bestseller in the UK. Her book No One Saw a Thing was a Sunday Times number one bestseller and has sold over half a million copies. Andrea lives in Dublin with her husband and three children. You can find Andrea on Instagram @andreamaraauthor