The dramatic disappearance of the wife of a wealthy businessman from a small hotel on the French Riviera prompts a distinguished English widow to recount her fleeting encounter with a young aristocrat many years before in Monte Carlo.

So begins an extraordinary day in the life of Mrs C – recently bereaved and searching for excitement and meaning. Drawn to the bright lights of a casino, and the passion of a desperate stranger, she discovers a purpose once again but at what cost?