STRICTLY SPEAKING, OF COURSE, it wasn’t Mary Shelley who arrived in Bath on 10 September 1816, but Mary Wollstonecraft Godwin. The nineteen-year-old who alighted in the city that Tuesday afternoon wasn’t yet the wife of Percy Bysshe Shelley, the up-and-coming poet and heir to a baronetcy. Instead, she was his unmarried partner, as well as...