"Catherine Walker is an Irish actress, notable for British and Irish television appearances including The Clinic, Northanger Abbey, Bit…"Catherine Walker is an Irish actress, notable for British and Irish television appearances including The Clinic, Northanger Abbey, Bitter Sweet, Critical and A Dark Song. More recently, she appeared as Madame Scarron/Madame de Maintenon in series 2 of the TV series Versailles. She also appeared as Alice Brooks in Series 4 of the BBC drama Shetland."