During the Choose Your Own Adventure (RSOTW, 2008) book craze in the early 1980s, interactive fiction meisters Infocom decided to get in on the act by publishing a series of Zork-themed "What-Do-I-Do-Now" titles through TOR Books.
Here is one of them, formally titled Zork #4: Conquest at Quendor. It was written by none other than Infocom legend Steve Meretzky, whom I met briefly in person back in 2008. He is a very personable fellow. (FYI: Back in 2007, Meretzky made a cameo in Jason Scott's video for the Zork-themed "It Is Pitch Dark" by MC Frontalot, which I love.)
As for the book, I haven't read it in ages, so I am not equipped at present to tell you if it's any good. I just recently found it in a box of my brother's old computer game boxes at my parents' house (which seems to be how a lot of these scans originate these days). My brother is and was a huge Zork fan, which reminds me that we need to play Zork Nemesis together again sometime.
I will add that the cover art featuring a translucent, floating fuzzy tiger-snake with squidlike suction cups on its body always freaked me out a bit as a kid.
Discussion Topic of the Week: What's your favorite entry in the Zork game series?