In 1982 Michael Fagan broke into Buckingham Palace and got into the Queen's bedroom. At the time reports suggested Fagan and the Queen had had a conversation, although Fagan has denied this. Helen Greaves's film imagines a conversation that an intruder (Eddie Marsan) might have with the Queen (Emma Thompson). The situation is absurd but within in it Greaves brings out a naturalness in the Queen as she shares her thoughts on happiness, marriage and love with her intruder - while munching on a dog biscuit.