A successful Parisian architect discovers that his humble northern French origins are far removed from the sophisticated image he has carefully cultivated, when his eccentric working-class family from the Ch'ti region unexpectedly descends on his life. Chaos ensues as he struggles to keep his two worlds apart, particularly from his equally image-conscious fiancée and her snobbish family. The comedy explores themes of class, authenticity, and the lengths people go to in order to hide where they come from.