Claire Clairmont (1798–1879), her journals and letters brilliantly edited, is in no danger of being lost to history. However, a significant quantity of her writing remains only partially published, autobiographical memoranda and (apparently) copies of letters that she prepared in the 1870s at the urging of E. J. Trelawny. These manuscripts, 159 pages in total, are catalogued as Cl Cl 26 in the Pforzheimer Collection at the New York Public Library. Extracts, with warnings to readers not to trust these papers, have appeared in biographies and editions; they narrate some of the most dramatic and painful episodes of Clairmont’s life: her 1814 elopement with Mary Godwin and P. B. Shelley; the suicides of Harriet Shelley and Frances Imlay Godwin;...