The Prime Minister

The Prime Minister - When neither the Whigs nor the Tories are able to form a government on their own, a fragile compromise coalition government is formed, with Plantagenet Palliser, the wealthy and hard-working Duke of Omnium, installed as Prime Minister. The Duchess, formerly Lady Glencora Palliser, attempts to support her husband by hosting lavish parties at Gatherum Castle in Barsetshire, a family residence barely used until now. Palliser is initially unsure that he is fit to lead, then grows to enjoy the high office, and finally becomes increasingly distressed when his government proves to be too weak and divided to accomplish anything. His own inflexible nature does not help.
This is book #5 in the Palliser series novels by Anthony Trollope.
Can You forgive Her
Phineas Finn
The Eustace Diamonds
Phineas Redux
The Prime Minister
The Dike's Children