A competent but problematic tale of love in a time of war told from a teen perspective. Ronan is excellent in the role of Daisy, an American girl who falls for her cousin during an idyllic summer in Britain that is disrupted by the outbreak of war, but her character starts out as intensely dislikeable and never really recovers, and the backdrop of the war against which the romance is played out is so sketchily portrayed that its vagaries become a major distraction. And, yes, sexual relations between cousins is legal in Britain.