England, 1800. The daughter of an Oxfordshire country doctor, Caroline Fairbanks, arrives in London accompanied by her handsome but dissolute fiancé, Captain Roger Soames. But Caroline quickly sours on Roger's boorish social circle, which includes the arrogant Lord Jack Willoughby, who pursues her despite her engagement to his friend. Meanwhile, Irish-American shipwright Declan Fitzpatrick has delivered a newly-built ship to its English owners and is eager to return to his Philadelphia home. When Declan intervenes in a violent quarrel at a society party involving Caroline, he becomes her reluctant protector and that changes their futures in a way neither could ever have imagined.