Grace and Riley are childhood sweethearts who secretly marry when she turns 18. Soon, things fall apart and Grace is in hiding in Paris, restoring antiques in a dodgy shop. While there, she learns that Riley and one of his best friends, Alls, have been released from prison three years after committing a robbery in their small Tennessee hometown. Grace happened to be studying in Prague at the time. Could she have played some part in the crime? Unbecoming details Grace's coming of age in Garland, her relationship with Riley, with his family and friends, and her general unease that someone from her past might be coming to find her.