Mirabelle is the "shopgirl" of the title, a young woman, beautiful in a wallflowerish kind of way, who works behind the glove counter at Neiman Marcus "Selling things that nobody buys anymore..." Slightly lost but not off-kilter, very shy, Mirabelle charms because of all that she is not: not glamorous, not aggressive, not self-aggrandizing. Still there is something about her that is irresistible. Mirabelle captures the attention of Ray Porter, a wealthy businessman almost twice her age. As they tentatively embark on a relationship, they both struggle to decipher the language of love - with consequences that are both comic and heartbreaking.