Two women. Two explosive secrets. And both are worth killing for.

Mellie anxiously twists her wedding ring around her finger as she stares at the attic door. It’s the one place her mother-in-law could have hidden the secret that will undo her. Because all this time, Mellie has been lying to her dream husband about who she really is.

As she searches with shaking hands, she discovers something she never expected. Her mother-in-law has her own dark secret too. It’s been here in the attic the whole time. And it has the power to destroy everything.

As her mother-in-law climbs up the stairs, Mellie’s heart pounds as she realises her world is about to come crashing down. Both women have secrets worth killing for. But only one of them will make it out of this house alive.

An unputdownable and addictive thriller that will leave you on the edge of your seat. Packed with twists, this psychological thriller is perfect for fans of Freida McFadden’s The Housemaid, The Girl on the Train and Colleen Hoover’s Verity.

What readers are saying about The Mother Upstairs:

‘OMG!!! I could not put the book down!!… Kept me up way past my bedtime!!’ Goodreads reviewer, ⭐⭐⭐⭐⭐

‘UNPUTDOWNABLE… This gripping, page-turning thriller will keep you GUESSING till the very end… Unforgettable… Jaw-dropping… A story that’ll leave you breathless… A MUST-READ.’ sapphirenst9ne, ⭐⭐⭐⭐⭐

‘Becca Day does it again!… Hooked me from the first chapter and kept me guessing the entire time… A must-read… keep[s] you turning pages late into the night… I loved it!’ nicole_day27, ⭐⭐⭐⭐⭐

‘Had my heart pounding for the better part of my evening!… Will keep you on the edge of your seat well into the night!… Loved it… I read it in one sitting!… A must-read thriller for 2026!’ Goodreads reviewer, ⭐⭐⭐⭐

‘Absolutely loved… Honestly couldn’t put it down… Keeps you completely hooked… Gripping… A fast-paced, addictive psychological read.’ emandmariereads, ⭐⭐⭐⭐

‘I read this in a day… Exceptional… This book was GRIPPY!… Kept [me] guessing until the end.’ arcreviews_by_m, ⭐⭐⭐⭐⭐

‘Grabbed my attention right away and didn’t let go… Kept me guessing… I needed to know what was really going on. A sharp, gripping psychological read that was hard to put down.’ sahara8098, ⭐⭐⭐⭐

‘Had me hooked for the beginning and I loved it! The setup was irresistible and there was so much tension from the beginning!’ Goodreads reviewer, ⭐⭐⭐⭐⭐

‘A fast-paced, unputdownable, thrill ride… Had me on the edge of my seat, flying through the pages.’ Goodreads reviewer, ⭐⭐⭐⭐⭐