Sophie Bellizzi is a hard-working perfectionist who is obsessed with getting her company off the ground. She has a strained relationship with her younger sister Juliana, and an even more difficult one with her grandmother who is obsessed with seeing her only grandchildren married so as to protect the family's wealth. When Sophie breaks it off with her cheating boyfriend, she is abruptly faced with her grandmother's cunning plan to pass her substantial inheritance onto her sister, unless she marries before her 30th birthday, which is in three months time. Sophie has to act fast.

25 Million Pounds details the collapse of Barings Bank in the mid 1990s primarily by a broker called Nick Leeson, who lost £827 million ($1.3 billion) by speculating on futures contracts. The film contextualises the downfall as the history of Barings Bank was one of the oldest and most prestigious merchant banks in Britain, run by the same family for decades with extensive ties to Britain's elites. But in the late 19th century Barings almost went bankrupt after investing heavily in South American bonds, including backing the construction of a sewer system in Buenos Aires. The bank was saved by The Bank of England, but Edward Baring, the head of the bank, was financially ruined and never recovered.