In this fresh new look at a classic story Russell Brand reinvents the role of loveable billionaire Arthur Bach an irresponsible charmer who has always relied on two things to get by his limitless fortune & the good sense of his lifelong nanny & best friend Hobson (Helen Mirren) to keep him out of trouble Kind-hearted fun-loving & utterly without purpose Arthur spends every day in the heedless pursuit of amusement But when his unpredictable public image threatens the staid reputation of the family foundation Bach Worldwide he is given an ultimatum marry the beautiful but decidedly unlovable Susan Johnson (Jennifer Garner) an ambitious corporate exec who can keep him in line or say goodbye to his billion-dollar inheritance & the only way of life he knows It's a deal Arthur would be inclined to takeif he hadn't just fallen for Naomi (Greta Gerwig) a New York City tour guide who shares his idealism & spontaneity The independent Naomi sees Arthur not only for who he is but for who he could be & finally gives him a reason to take charge of his own life All he needs to do is stand up for what he wants But at what cost? With some unconventional help from Hobson-the one person who always believed he could do anything--Arthur will take the most expensive risk of his life & learn what it means to become a man