In the years before the First World War, three Britons are drawn into fraught and ultimately tragic relations: Anglican Christopher Tietjens, second son of the lord of the manor of Groby, Yorkshire, who is a disconsolate, Tory statistician in London; Catholic Sylvia Satterthwaite, his promiscuous and self-centered socialite wife who has married him only to hide the fact that their son is not really his; and freethinking Valentine Wannop, a young suffragette and daughter of a lady novelist, who is torn between her idealism and her attraction to "Chrissy". As the war works a profound change on Europe, and Chrissy is badly wounded in France, the conflict shatters and rearranges the lives of all three principals, as well as virtually everyone else in their elite circle.
In 1818, high-spirited young Fanny Brawne finds herself increasingly intrigued by the handsome but aloof poet John Keats, who lives next door to her family friends the Dilkes. After reading a book of his poetry, she finds herself even more drawn to the taciturn Keats. Although he agrees to teach her about poetry, Keats cannot act on his reciprocated feelings for Fanny, since as a struggling poet he has no money to support a wife.
The US President and the UK Prime Minister are planning on launching a war in the Middle East, but—behind the scenes—government officials and advisers are either promoting the war or are trying to prevent it.
Peter Mannion's speech on immigration, leaking the PM's policy, did not have the effect Tucker desired and now the PM is resigning, leaving the way clear for the Nutters and their leader Tom. Ollie has been promised a job by young Nutter Ben Swain, Tucker's assistant has encouraged Hugh's predecessor Cliff to stand as a stalking horse and Glenn is keen to keep Hugh in the frame whilst his boss is in Australia. Fortunately Tom has a dark secret which is just what Tucker is looking for but will it be enough?
With Hugh in Australia and Glenn in Wales, Ollie is left in charge, feeding policies to junior minister Ben Swain. He is one of the 'Nutters', the group keen to take power when the P.M. resigns and keen to make a name for himself - which he does in the wrong sense when Jeremy Paxman skewers him on 'Newsnight'. This is music to Tucker's ears as it is in his interest for the P.M. to remain in power for as long as he can. Ollie's new girlfriend Emma is working for Shadow Minister Peter Mannion and hopes to impress by stealing one of Ollie's idea for use on their immigration policy though things do not go fully to plan.
