This is a guide to manuscript lists and indexes of people who lived or worked in London during various time periods. A collaboration between the Centre for Metropolitan History and the Federation of Family History Societies, it identifies unpublished indexes held in London record offices, local libraries, and family history societies. While a complete breakdown of the type of lists contained in the work would be somewhat excessive, we can point out several that are typical: parish records, marriages, wills, gravestones, censuses, taxes, oaths, and voters' lists, among others. Entries typically include the title of the index, a rough estimate of the total number of names included in the index, and the abbreviated name of the compiler or holding institution (full names and addresses are given at the beginning of the book). For those researching elusive London ancestors, this is a magnificent aid.