This book is one of the best I've ever read on Star Trek. While I use it to look up specific things once in a while, I mainly use it as a good book to browse through at any time. Whenever I open it, I find out something that new that I didn't know before, or something old that is just as informative to read a second or even a third time. It gives a detailed biography of all the different main characters, from Captain Picard to Commander Riker, Lt. Cmdr. Data, Lt. Cmdr. Worf, Counselor Deanna Troi, Geordi LaForge, Dr. Beverly Crusher, Ensign Wesley Crusher, Chief Miles O'Brian, Captain Sisko, Lt. Cmdr. Jadzia Dax, Major Kyra Narys, Security Chief Odo, Dr. Julian Bashir, Captain Janeway, Commander Chakotay, Seven of Nine, and much more! Besides this, it lists detailed descriptions and diagrams of the main ships, and gives at least mention of almost every kind of ship that is mentioned on Star Trek at any time. There are several charts and tables that make up detailed lists of all known kinds of races/life forms that exist, all known planets, all known names of Starships, all known planet names, and more. Basically, if it was mentioned in any episode of any of the Star Trek series, you will probably find it somewhere in this book, and the best part is that it's all in alphabetical order, organized just like an Encyclopedia of the 20th century! I definately recommend it to any Trekkie, die-hard or not! This book deserves a 6-star rating, it is unlucky that 5 is the maximum!