When 16 year old Mary Wollstonecraft Godwin runs away with poet Percy Bysshe Shelley, her family are horrified. Young and passionately in love, at first she relishes life amongst the radical Romantics. But as time goes on, Percy's betrayals and indiscretions begin to test their relationship. One day, on a trip to Lord Byron's mansion in Geneva, Mary is challenged to write a ghost story. Drawing on her experiences of heartbreak and the dark side of humanity, she creates 'Frankenstein', a work that will shape the literary world for centuries.