Mary Shelley wrote the most famous monster story of all time, Frankenstein. Or did she really? That question is just one of the literary mysteries explored by Lynn Shepherd in her mesmerizing novel, A Fatal Likeness. Was Percy Bysshe Shelley insane or cruelly narcissistic or simply misunderstood? Were his poems reflective of reality or rooted entirely in his wild and torturing (to say nothing of tortured) imagination? Did Shelley sire the child of his step-sister-in-law Claire Clairmont, or was it Lord Byron, as the Shelley clan always claimed? And in what is a most tantalizing tangent for me (lover of letters that I am), do the surviving letters of Percy, Mary, and Claire tell the truth – or merely hint at what were dark and deep secrets for the twisted trio of lovers?