From the #1 New York Times bestselling author of Alex & Eliza comes a return to adult fiction, centered around a mysterious woman’s birthday celebration-and what it reveals about her past.

Ellie de Florent-Stinson is celebrating her fortieth birthday with a grand celebration in her fabulous house in Palm Springs.

At forty, it appears Ellie has everything she ever wanted- a handsome husband; an accomplished, college-age stepdaughter; a beautiful ten-year-old girl; two adorable and rambunctious six-year-old twin boys; lush, well-appointed homes in Los Angeles, Park City, and Palm Springs; a thriving career as a well-known fashion designer of casual women’s wear; and a glamorous circle of friends.

Except everything is not quite as perfect as it looks on the outside-Ellie is keeping many secrets. This isn’t the first birthday celebration that hasn’t gone as planned. There’s a certain sixteenth birthday that she’s tried hard to forget.

But hiding the skeletons of her past comes at a cost, and all of Ellie’s secrets come to light on the night of her fabulous birthday party in the desert-where everyone who matters in her life shows up, invited or not. Old and new, friends and frenemies, stepdaughters and business partners, ex-wives and ex-husbands congregate, and the glittering facade of her life crumbles in one eventful night.

Beautifully paced and full of surprises, The Birthday Girl is an enthralling tale of a life lived in shadow, and its unavoidable consequences.