As the contest to be crowned 'best workplace choir' continues, choirmaster Gareth Malone enters the embattled world of high finance, high flyers and rock bottom reputation at one of the biggest investment and trading banks in the world, Citi, in London's Canary Wharf. With Gareth imagining long lunches and cigars, he finds himself in a lock down during an anti-capitalist protest, learns how many noughts there are in a trillion and creates his most musically accomplished workplace choir yet. When the bankers choose to sing Man In The Mirror could it signal a moment of reflection or will they drive on with technical ambition and ignore Gareth's attempts to find some heart?