Mary visits Powderham Castle in Devon to spend time with the Earl and Countess of Devon and their two young children, who are reinventing the Earldom for the 21st century. Mary's time with the family reveals stories of romance and tragedy as she discovers more of this extraordinary home. In the castle's historic kitchen, Mary prepares a Devon cream tea, before making a delicate peach posset for a Midsummer Eve woodland party the family are throwing to celebrate their two year anniversary at the castle.

• Mary Berry