When a man's fianceé is shot dead on the couple's wedding day by a rejected lover who was aiming for him, was left to raise his fianceés niece who eventually falls in love with the murderer's son. The past sweeps back to haunt the present.

Pat Jamieson is a scientist working on a high-altitude oxygen mask for World War II fighter pilots. He has nowhere to conduct his research until he meets Jamie Rowan, a woman with a large empty country house. She has no hopes of marrying for love but Jamie wants to help the war effort and she likes Pat, so to satisfy the proprieties they agree on a business arrangement: a marriage of convenience and partnership. They happily work on oxygen mixes instead...

An acrobatically inclined free spirit, following a whirlwind engagement, literally tumbles into the lives of his fiancée's aristocratic family, setting up a clash of values with her staid father while firing the rebellious imagination of her brash, black-sheep sister. With a sparkling surface and an undercurrent of melancholy, the film is an enchanting ode to nonconformists and pie-in-the-sky dreamers everywhere, as well as a thoughtful reflection...