The Prime Minister is the fifth in Trollope's series of six Palliser novels. With Phineas' difficulties resolved, Trollope introduces new characters. A respectable young girl forsakes the man her family had always intended her to marry when she falls in love with a man of foreign extraction and an unknown family. He has a gentleman's education and manners, but his family background and financial means are mysterious. Is he really a gentleman? Meanwhile, Plantagenet Palliser becomes Prime Minister of a shaky coalition government, and Glencora and Madame Goessler are busy with the ensuing social obligations.