Second in Blish's 11-volume series of sketchy, workmanlike adaptations of the original Star Trek episodes -- this one noteworthy only because it contains another version of Ellison's The City on the Edge of Forever. Or, rather, a version of Gene Roddenberry's version of Ellison's script, which is hardly the same thing.
Blish's introductory footnote acknowledges the vast differences between the two scripts and contends that his adaptation combines the best of the two, but that's clearly not the case. At best, this 16-page narrative outline borrows some of the best of Ellison's dialogue, but it retains most of Roddenberry's story structure -- except, inexplicably, for McCoy's arrival on Earth and his subsequent, seemingly impossible intersection with Edith Keeler, the "focal point in time." The result is a mishmash and clearly the worst of both worlds.
As for the rest of these stories: for Trekkies only.