Toronto, 1926. A childless millionaire leaves behind an astonishing will: the recipient of his fortune will be decided in a contest known as 'The Great Stork Derby'. His money will go to the winner: the woman who bears the most children in the ten years after his death.

Lily di Marco is young, pregnant, and terrified of her husband. Fleeing to Toronto, she arrives on the doorstep of glamorous free spirit Mae Thebault.

At a time when men hold all the power, Lily and Mae look out for each other. But as their friendship grows, Lily wonders if there's more to Mae - and her past - than she has been told. And as the Great Depression bites, the Stork Derby contest - with its alluring prize - proves too good to ignore for Lily and Mae, each living hand to mouth. These best friends are now fierce rivals.

But if only one woman can win, what will the contest cost the other?