Forty Going on Nineteen by Kristina Thornton

Two best friends. One outrageous week. Ten birthday dares. And a plan to turn back the clock… just a little.

Louise Nightingale, a routine-loving single mum, is hitting forty and feeling stuck. Enter Katie Sinclair: party planner, mischief instigator, and her best friend. She’s whisking Louise back to her hometown of Doncaster, South Yorkshire, for a week of pubs, bubbly, and very carefully crafted chaos.

The catch? Ten challenges designed to push Louise out of her comfort zone. Cue the embarrassing moments, questionable decisions, and a very familiar face—Tom Gardner, her school crush, turned slightly-too-charming adult. He’s handsome, smug, and possibly a little off-limits... or maybe not.

Full of laughter, flirting, and the kind of friendship that saves you from yourself, this is a delightfully cheeky story about love, life, and taking a few chances before forty hits.

If you love books about lifelong friendships, laugh-out-loud mishaps, and swoon-worthy, second-chance romance, this charming tale of self-discovery, daring challenges, and unexpected love will have you smiling long after the last page.