Fictionalized story of Mary Godwin, author of the horror classic "Frankenstein," and her relationship with poet and freethinker Percy Shelley, who ran away to Europe to escape gossip and social ostracism in London, and who endured tragedy and terrible losses repeatedly in her life. In the spring of 1814, poet Percy Shelley enters the life of young Mary Godwin like an angel of deliverance. Seduced by his radical and romantic ideas, she flees with him and her stepsister to Europe, where they forge a hardscrabble life while mingling with other free-spirited artists and poets. Frowned on by family and society, persecuted by gossip, and plagued by jealousy, Mary becomes haunted by freakish imaginings and hideous visions. As tragedy strikes, not once but time and again, Mary begins to realize that her dreams have become nightmares, and her angel . . . a monster. Now the time has finally come for the young woman who would become Mary Shelley to set her monster free.