Zork
A fabulous kingdom in which you decide what happens! With wizards, princes, a magical helmet, a fiendish villain, and adventure on every page. And you decide the outcome! Based on the most popular computer game in the world!
#4 CONQUEST AT QUENDOR
Unless you can find the magical helmet of Zork, the kingdom will be plunged into total war. Jeearr, a very strange being, seems helpful at first. But should you trust him? The fate of ZORK may depend on your answer!
ISBN 0-812-55989-4 first printing October 1984
Cover scan and details provided by Allan Palmer.