The Two Lives of Lydia Bird meets This Time Next Year in a sliding-doors style romance and coming-to-self story about fate, chance, and the choices we make.

What if “meant to be” happened twice?

Lucy is at a crossroads. The same night she quits her thankless job she meets Caleb, a local photographer in her seaside town, and has a run-in with Max—the once love of her life. As Lucy decides the right path forward—finally pursue her dream of becoming a writer, or move to London and revive her career—her choice will change her life in unimaginable ways.
 
Stay. After a decade of trying to run from her dream, Lucy is finally facing her fears and putting pen to page. With her budding romance with handsome, artistic Caleb, she has more inspiration now than ever. But can Lucy and Caleb open themselves up after their past heartbreaks? And will their different paths take them to the same place?
 
Go. Lucy can’t believe her luck when a room in her best friend’s London house share opens up and she lands a job at the prestigious Supernova. It gives her the courage to face Max, who’s serendipitous encounter still has her reeling, and ask what really happened almost a decade ago? But does she really want to know, when being together feels like fate?
 
In concurrent storylines that track what would have happened if Lucy chose to Stay or Go, What Might Have Been is a sweeping story that poses the questions: is it destiny or chance that decides who we are meant to be, and who we are meant to love? And is there such a thing as a soul mate?
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“Fans of Josie Silver’s The Two Lives of Lydia Bird (2020) and Matt Haig’s The Midnight Library (2020) will enjoy this thoughtful take on the question of destiny versus chance.” —Booklist

“Miller gracefully intertwines an impressive number of threads across the two paths…[and] addresses intense, complicated issues with a sure hand and skillfully sustains the Sliding Doors conceit. Readers will be captivated throughout.” —Publishers Weekly

“A bittersweet tale of love lost and found that explores how even good people can make mistakes and find redemption in love.” —Kirkus

“Explores a question all of us have contemplated—what would my life be like if I’d made a different choice? It’s a moving, ultimately hopeful love story about how we navigate our chosen paths in life. I couldn’t put it down.” —Sophie Cousens, author of This Time Next Year

“Is there a life you should have lived but never got the chance to? But would getting to live it be the right choice with the right outcome? Miller’s moving love-infused new novel probes the two separate realities of one spectacular woman: a life with the man who was her past, and a life with a man who could be her future. About the stories we struggle to write and the stories we yearn to live—and a total, addictive knockout.” —Caroline Leavitt, author of Pictures of You and With or Without You

“A beautifully original and so cleverly woven sliding doors story, with characters that will lodge their way into your heart. Poignant, thought-provoking, wonderfully romantic, a little bit heartbreaking at times but ultimately uplifting.” —Emily Stone, author of Always, In December

"Like the very best love stories, I had no idea how this book was going to end, just that I was going to be an emotional mess when it was over—and I was right. A gorgeous treatise on fate and soulmates, What Might Have Been will charm you, break your heart, piece it back together and then have you shoving the book in all your friends' hands, so they can fall in love, too." —Colleen Oakley, author of The Invisible Husband of Frick Island

“A sweepingly romantic and heartwarming story of ‘what if’. Holly Miller is such a beautiful, beautiful writer. I adored it.” —Lia Louis, author of Eight Perfect Hours

“One of those novels that sweeps you up from the very first page and doesn’t let you go until long after the last. I was completely hooked…It’s a novel that breathes heart and hope and which I can’t recommend highly enough. I adored it.” —Jenny Ashcroft, author of Meet Me In Bombay

“Miller creates two utterly compelling stories, revealing how our lives can turn on a single moment and how true love will never be denied no matter what choices we make. With convincing characters and bold twists and turns, this is a funny, poignant and overwhelmingly romantic story for anyone who's ever wondered about the one who got away. Unmissable.” —Katie Marsh, author of The Rest of Me

“Such a beautiful, thoughtful story of finding happiness on life’s many different paths.” —Abbie Greaves, author of The Silent Treatment

“Beautifully written, moving and impossible to put down, this book packs an emotional punch. It’s a heartfelt read that will capture your imagination and keep you hooked to the last page.” —Sarah Harris, author of The Color of Bee Larkham’s Murder

“Compulsive and beautifully written. A must read! A novel full of emotion, excitement and the enormity of choosing the right path.” —Nicola May, author of The Corner Shop in Cockleberry Bay