Peter Standish (Tyrone Power) is living in an 18th-century house on Berkeley Square where his distant relative %u2013 also Peter Standish %u2013 once lived centuries before. But when he is struck by lightning, he suddenly finds himself in the 18th Century! Peter meets his ancestor%u2019s fiancée Kate Pettigrew (Beatrice Campbell) but it is her sister, Helen (Ann Blyth) with whom he falls in love. As Peter tries to hide his true, modern identity, a jealous Kate makes trouble and before long, Peter finds himself back in the present where his true love might not be lost after all.