The volume consists of two independent but related parts. Part I (pp. 13-140) contains five thematic essays based upon the letters: Psellos’ educational networks (Floris Bernard), his monastic contacts and concerns (Michael Jeffreys), the Patriarch Keroularios’ nephew Constantine (Michael Jeffreys), Psellos and his long-time associate John Mauropous (Marc Lauxtermann), and Psellos’ use of irony in letters to the problematic protosynkellos Leon Paraspondylos (Diether Roderic Reinsch). Part II (pp. 143-445) contains Michael Jeffreys’ careful summaries of every letter in the Psellan canon, including four letters from Psellos’ correspondents that regularly accompany his letters in manuscript collections. The summaries are generally presented in the order in which they appear in Kurtz-Drexl (KD), Gautier (G), Maltese (M), and Sathas (S). Jeffreys deviates from this pattern in the case of 30 small groups of letters on a unified theme (e.g., “Support for a Young krites of Armeniakon. Probably Psellos’ Son-in-Law,” i.e., five letters collected and reordered from KD and S (pp. 194-96)). An appendix on dating the letters, a bibliography, and an index primarily to the summaries follows. As Lauxtermann explains in the introduction (p. 11), the summaries are a guide for scholars to use in efficiently locating letters that may respond to their individual interests. These summaries are not translations, but rather a tool enabling scholars to focus upon letters within this huge corpus that might justify investing the time and effort required to explore passages of value to their own work.