Blue Blood is a 1973 British horror drama film directed and written by Andrew Sinclair and starring Oliver Reed, Fiona Lewis, Derek Jacobi and Anna Gaël. It was based on the 1972 novel The Carry-Cot by Alexander Thynn, 7th Marquess of Bath.

Plot

Gregory, the young lord of the Swanbrook estate, engages German nanny Beate to care for his children while he pursues a life of debauchery with his mistress Carlotta and their affluent friends. His wife Lily, a touring singer, makes occasional visits. Gregory entrusts all running of the Swanbrook manor house to his menacing butler, Tom, who scorns his weak-willed master's decadent ways and plots to take control. From her interactions with the other servants, Beate comes to realise that Tom is, in many ways, already the true master of Swanbrook.