Can one decision change everything?

I couldn't believe that Bec would, after all these years, bring the whole thing up so ... casually.

Bec and Kate are sisters, but they couldn't be less alike. Bec lives the domestic dream with her surgeon husband Stuart and three perfect children. So why is she so attracted to free-spirited Ryan? Kate's life is hardly a dream. But when she meets Adam - tall, kind, funny - things start looking up. Until she finds out he's been keeping secrets from her.

Then there is the incident both sisters are desperate to ignore...

Will they discover that some mistakes can't be put right?

For fans of Liane Moriarty and Marian Keyes comes a tantalising, suspenseful read that will have you addictively turning the pages.

'I absolutely loved this novel: fresh, funny and heartfelt. I didn't want it to end!' - LIANE MORIARTY

'Addictive storytelling from an exciting new talent' - FIONA McINTOSH

'A firecracker of a book, rich in humour, warmth and insight. I couldn't put this down.' - JACLYN MORIARTY

‘What a treat to read! The Mistake is an intelligent thriller with heart and guts — fantastically funny yet creepily menacing. Brilliantly written and immersive, it's a wonderful tale of what it means to be a sister, a mother, a wife and a lover in a world that judges on first appearances — and sometimes bears a grudge’ — HARRIET WALKER, author of The New Girl

‘I was turning the pages well into the night. I loved it — that undercurrent of menace, but never quite knowing where the menace is coming from.’ — SARAH J NAUGHTON, author of The Mothers (The Sunday Times Crime Book of the Month)

‘The Mistake fits so much in — brilliantly drawn characters, witty asides, and twists and turns that make you race to the end. Whether you’re rooting for them or wanting to shout at them, the sisters’ lives are ones you want to keep reading about. I loved it. It totally got me out of my lockdown reading slump! McMahon writes like a dream.’— ASIA MACKAY, author of Killing It (runner up in Richard and Judy’s ‘Search for a Bestseller’ & Exceptionally Recognised for the Comedy Women In Print prize)