I've read Enemy Territory 1.5 times (first time all the way through, second time my favorite parts) and First Mate Bialar flew right past me.
About Ishmael, Mary P. Taylor, who put together the "Star Trek: Adventures in Time and Space" compilation, said
"One book that I would have loved to include, but could not for legal reasons, was the Barbara Hambly book Ishmael, which wanders into another universe that does not belong to Paramount," added Taylor. Ishmael features characters and situations from the 1968 television series Here Come the Brides starring Mark Lenard, who also played Spock's father. "That was a fun read, but I think they had to work out a deal just to publish it in the first place."