The scientist is quizzing his robot: ""You say you flew on a broom?"" ""Affirmative."" The American physicist's incredulity mounts as he and Sir MacHinery (the mechanized knight of the title, so named from the word MACHINERY stamped on his packing case) traverse the Scottish Highlands with two local mortals, a community of one-foot tall Brownies, a witch named Maggie MacMurdoch, and the wizard Merlin, freed from a sleep of centuries when the robot wins a contest of wit and strength with the Loch Bree monster. Their goal is to defeat an ancient race of demons commanded by the diabolic Urlug, whom they finally destroy in his underground lair through the cooperative action of Merlin's powerful conjuring and the physicist's technological wisdom. McGowan tosses in about every gimmick from Tolkien to Danny Dunn, but as he mixes them well and takes none of them too seriously, this will reach readers who seek diversion somewhere between those extremes.