A mysterious man arrives in London and, in a freak accident, gets electrocuted on an underground train and loses his memory. A young lady called Sally Nightingale feels responsible, and brings him home to her mother. But in a strange twist of fate it transpires that her mother is the man's ex wife, whom he left twenty years earlier in unhappy circumstances. The old attraction is there, but what will happen if and when his memory returns? A highly melodramatic plot, but with a deft comic touch, a host of vibrant characters, and a large dash of romance...