Seventeen-year-old Harley Martin has been obsessed with Paris for years. Between her passion for studying architecture and wanting to spend time with her cousin, Gretchen, there's nowhere on Earth that she'd rather go. So when Harley's parents feel guilty enough about their constant fighting to offer to send Harley to visit her cousin, Gretchen, she doesn't hesitate.But Gretchen and Harley have both changed in the years they've been apart. In an...