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The collected works of Leo Tolstoy were printed and published in 90 volumes of some 46,000 pages between 1928 and 1958. This paper, however, is not about the 90 volumes themselves, but about the 91st volume of this edition, a supplement volume containing indexes of works and proper names, from both the fictional works and the many volumes containing Tolstoy's letters. "The 91st Volume" is a web application based on the digitised index of proper names for the 90-volume collection of Tolstoy's collected works (http://index.tolstoy.ru/). The digitised data features additional properties, which can be explored by the enthusiast as well as the specialist. This paper tries not just to present a new tool for literary scholars, but tries to generalise how this kind of resources can be used to gain new insights into larger text collections