The doorbell rings, just days after my beloved husband's sudden death. I don't recognise the woman on our doorstep, with her buttery blonde highlights, a diamond bracelet identical to my own and a bouncing baby boy in her arms.

As I show her inside, I notice her eyes grow wide as she takes in our spacious hallway, and the big squashy sofas that we all used to pile on. She glances at the silver-framed family photos and my little daughter hiding behind my skirts.

She looks at me, her blue eyes serious. 'I'm sorry' she says. 'I know this will be hard to hear. But I am your husband's girlfriend. And this is his son.'

My world implodes. And then she tells me that she owns our home - and that she's not going anywhere...

An utterly gripping psychological thriller from the number one bestselling author of The Marriage. If you like Gone Girl, The Girl on the Train and Lisa Jewell then you will be hooked by The Girlfriend.

See what everyone is saying about The Girlfriend:

'This book was a nail biter! It had suspense, intrigue, murder, and so many crazy twists and turns! The storyline was very interesting and had me glued to my Kindle! I highly recommend reading this book! It was definitely worth reading!' Netgalley reviewer, ⭐⭐⭐⭐⭐

'One thriller of a read!... OMG- one of those reads you can't put down as every page puts you deeper into the mystery, just as I love them... truly brilliant. A wonderfully thrilling read that kept me turning the pages until the very end. ' Goodreads reviewer, ⭐⭐⭐⭐⭐

'Loved!!!!! Devoured in just a few sittings. It was just that good. In fact, it was her best book to date so far. It had so many twists and turns. I was hardly able to keep up. This author is one of my favorites and this book proved why. It kept me guessing the whole way through. I never knew what was going to happen next and I had to race through each chapter like it was the last just so I could find out the truth... I loved it...' Blue Moon Blogger, ⭐⭐⭐⭐⭐

''K. L. Slater hits the mark with The Girlfriend. With jaw-dropping plot twists, the novel is a remarkable read... The plot of The Girlfriend sounds crazy, but it works brilliantly. As I read the book my mind was constantly trying to figure out the next twist... You don't want to miss the mind-bending thriller!... outstanding... Way to go K. L. Slater! I love every page of this amazing story!... This book is absolutely fabulous.' Joannlovesbooktalk, ⭐⭐⭐⭐⭐