Time and Mr. Bass
Eleanor Cameron
 Tyco Bass has been a close friend to Chuck Masterson and David Topman ever since they built their space ship for a journey to the Mushroom Planet. Now Mr. Bass needs their help in a battle against time and the forces of evil that threaten the Mycetians, Mr. Bass and, finally, David. Upon their arrival in the mountains of Wales for a meeting of the secret Mycetian League, Mr. Bass and the boys discover that the ancient Necklace of Ta has been stolen. Also missing is the Thirteenth Scroll, believed to relate the history of the Mycetians. These must be found, for without the necklace, whose strange stones are carved in an unknown language, Mr. Bass cannot continue his effort to translate the Scroll. And without the secret of the Scroll, the evil power that has hounded the Mycetians for centuries cannot be defeated. Chuck and David must use their wits as never before in a search which takes them from a joyous celebration to a terrifying test of endurance involving Time itself.