The two volumes of this book are a fascinating and highly enjoyable read for anyone interested in the interactions between various pulp, mystery, adventure, and science fiction characters with real people throughout history. The premise of this book is inspired by SF writer Philip José Farmer’s “Wold Newton” concept which he developed in the 1970s: a “radioactive” meteorite crashed near Wold Newton, England in 1795 and affected several carriages full of people who were passing by. Their descendants became highly intelligent and powerful heroes (or villains) such as Sherlock Holmes, Professor Moriarty, Dr. Fu Manchu, Doc Savage, Lord Greystoke (aka Tarzan), and many more. Farmer wrote popular and detailed biographies of Tarzan and Doc Savage in which he detailed the family trees of many “Wold Newton Family” characters. Over time, the concept has been expanded and continued by others into the Crossover Universe. Win Scott Eckert has done a fantastic job of compiling references to literary heroes who have met each other (or “crossed over”) and had adventures together, and thus co-exist in the same fictional universe. Volume 1 covers the dawn of time up through 1939, and Volume 2 covers 1940 into the far future. Reading these two books is a fun and highly addictive experience!