American Susan travels with her father to England for a vacation. Invited to a society ball, Susan meets Sir John Ashwood and marries him after a whirlwind romance. However, she never quite adjusts to life as a new member of the British gentry. At the outbreak of World War I, John is sent to the trenches and never returns. When her son goes off to fight in World War II, Susan fears the same tragic fate may befall him too.

In World War II Washington DC, scientist Pat Jamieson's assistant, Jamie Rowan, enters a loveless marriage with him. Struggles bring them closer together.