The first season began with the Crawley family receiving word of the sinking of the Titanic. The heir to Downton Abbey and his son, Mary's fiancé, were on board, and with their deaths, it's now thrown into doubt who will inherit the estate. Because of an English law called an entail, whoever now inherits the estate will receive the house, land, and the family's money, and Robert has no say in who will get it after his death. A distant cousin named Matthew now stands to inherit everything.

Highclere Castle, which serves as the fictional Downton Abbey for filming
By Richard Munckton