Life doesn’t happen on a schedule, there are no deadlines in love, and age is just a number.

On the eve of her thirty-ninth birthday, Maggie Piper doesn’t look, act, or feel much different than she did at twenty-nine, but with her fortieth birthday speeding toward her like a freight train, she wonders if she should. The fear of a slowing metabolism, wrinkling of her skin, and the ticking of her biological clock leaves Maggie torn between a desire to settle down like most of her similarly aged peers and concern that all is not perfect in her existing relationship. When a spontaneous request for a temporary “break” from her live-in boyfriend results in a “break-up,” Maggie finds herself single once again and only twelve months from the big 4.0.

As Maggie reenters the New York City dating jungle, suitors present themselves quickly, but who is “The One?” Is he a sexy coworker, one of many bachelors at a speed-dating event, or is he the man she already set free? How do you know? Her fun-loving friends and supportive family, including meddlesome “no-filter” Aunt Helen, eagerly share their (often unsolicited) opinions, but Maggie is determined to find her own way, even if she falls on her face—repeatedly.