[Adept's Gambit], built around the characters of The Grey Mouser (personifying Harry Fischer) and the seven-foot sword-wielding giant Fafhrd (the romantic incarnation of Fritz Leiber, Jr.), is beyond question not only the first but the best of the entire series Leiber was to write about these characters…. From the moment that the spell is cast upon Fafhrd that temporarily changes every woman into a pig the instant he kisses her; on to the Grey Mouser's consultation with the seven-eyed Ningauble, gossiper with the Gods, about what to do about it; through the supernatural sword battle with Anara; to the finale, in which the adept turned to a mouse contemplatively evaluates its chances of killing a bear cub, the story is a delight to read.
Leiber's sense of pace, rich background detail, taut battle scenes, fine characterization, fascinating supernatural elements, together with his extraordinary talent for weaving tasteful humor throughout the entire fabric of his story—a talent unsurpassed by any living fantasy writer today—make this a classic fantasy. (p. 290)
In the outline for Gather, Darkness! Leiber suggested an underground using witchcraft and holding up Satan as its idol to overthrow the despotic scientific religion. (p. 293)
Perhaps Leiber was the better merchandiser of such ideas, possibly he was convincing where the others were not, but whatever the reason, and erroneously or not, in the minds of readers he came to be regarded as the transitional author who tied well-known elements of superstition to science in fiction.
Before the appearance of Gather, Darkness! Leiber was regarded as an important writer. That one story placed him among the "big names." Yet, its techniques and stylistic flow are clearly devices taken from Edgar Rice Burroughs; the author keeps two or more situations going simultaneously, carrying them along in alternating chapters. The chase scene in which the hero, Jarles, is rescued from the mob by the old "witch" Mother Jujy is obviously indebted to A. E. van Vogt's treatment in Slan, where Jommy Cross is saved from the mob by Granny. The personality changer used on Jarles is reminiscent of Stanley G. Weinbaum's "attitudinizer" in Point of View. From Leiber's own acrobatic tower in Two Sought Adventure comes the notion of the flexible "haunted" house. But these were merely ingredients that Leiber obtained for the literary stew; the spice he added to flavor it no one could lend him. There is the satire, pitiless in its excoriation of religion, satire deriving from Leiber's own personal observations. There is the cynicism regarding the scientists' ability to do any better than the politicians. There is the humor, mature, not light, not raucous, blending into the story. And there is the gift for characterization, effectively evidenced in Brother Chulian, Jarles, Mother Jujy, and the Familiar. (pp. 293-94)
Only slightly less successful than Gather, Darkness! was Destiny Times Three … to which Business of Killing …, a short story of the contemplated exploitation of simultaneous worlds, was a prelude. A machine built by an Olaf Stapledonian intelligence accidentally fragments the time stream of our planet into a number of "worlds of if," three of which, at least, have duplicated...
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