`If you ever wondered what would have happened if you took that job, caught that bus, accepted that invite, you'll love this.' Alison R.

THE MUST-READ UNFORGETTABLE ROMANCE OF THIS SUMMER.

Have you ever wondered*what if . . .*?

Millie's love life is a total train wreck. She's*always*attracted to the wrong man at the wrong time.

She's in love with her co-worker Stephen - but Stephen*is*very*married to someone else. So that's not happening in this lifetime.

But Millie does have one person she can always rely on, her BFF Bonnie.

At Bonnie's family home for a long weekend, Millie*steps through the basement door . . . and something extraordinary happens.

She finds herself in other versions of her life.

What if she'd married her nice-but-dull college boyfriend and they lived in a beautiful townhouse in Michigan? Or she was dating a tech billionaire? What if she'd become a single mom? Or a free-spirited writer?

By opening that door, Millie will have the chance to explore all her*what ifs.*But*what if*she can't find the life she wants with Stephen?

This sizzling story is perfect for fans of Taylor Jenkins Reid, Shari Low, Audrey Niffenegger, Jojo Moyes, David Nicholls, Colleen Hoover, Laura Barnett, Rebecca Searle and Holly Smale.