Glasgow, 1928. Margaret Bannatyne lost both of her brothers in the Great War and is now the last remaining child of wealthy and powerful shipyard owner William Bannatyne. Without a male heir to carry on the family business, William expects his daughter to do her duty, marry well and provide him with a grandson to inherit his business.

Margaret cares deeply for her father but she has ambitions of her own: after witnessing a horrific accident when she was sixteen, she's determined to become a doctor. Her father, convinced she will never practise medicine, permits Margaret to complete her training. But he doesn't count on her falling in love with Alasdair Morrison.

Alasdair, a union man at the shipyard, has been a thorn in William's side for years, and he didn't become one of the richest men in Glasgow only for Alasdair to take it all away - even if it means destroying his only daughter's happiness by forcing her to make a heartbreaking and impossible choice . . .