"The City on the Edge of Forever" is one of Star Trek’s finest hours. Harlan Ellison’s tale of personal sacrifice on behalf of others serves as the touchstone from which the lives of McCoy, Spock, and Kirk flow in David R. George III’s Crucible trilogy. These books, commissioned for the fortieth anniversary celebration, are unique in that they stand outside all other literary continuity. George limits himself to the original episodes, the animated series, and what we know of the original crew from references in later Treks. Also, while the stories can, theoretically, be read in any order, they really should be read in their order of release. The interweaving stories read better in order, and could serve to spoil the enjoyment of the other books. Sadly, reading the books in order may wind up leaving readers with a sub-par feeling at the end.