World War 2 Historical Romance

Celia has loved Jack Reed for as far back as she can remember, but he's only had eyes for her older sister Camilla.
When WW2 breaks out, he's sent overseas and Celia is heartbroken while Camilla is too busy writing to all her other boyfriends to bother with old reliable Jack- prompting the always devoted Celia to write him instead, slowly winning his heart.
When Jack finally sees Celia for the first time in 2 years, she's all grown up and he finally falls in love with the right sister.
He begs her to wait for him so they can marry after the end of the war and she almost agrees - but deep down she's afraid he's still in love with her sister and pushes him away.
But while he's back in Europe he finds out the girl of his dreams is about to marry someone else and he's determined to stop the wedding.
He's convinced his whole future happiness depends on him stealing someone else's bride for himself.