Star Trek #21: Uhura's Songby Janet Kagan
Years ago, Lieutenant Uhura befriended a diplomat from Eeiauo, a land of graceful, catlike beings. The two women exchanged forbidden songs and promised never to reveal their secret.
Now the Starship Enterprise must race to save the Eeiauoans before a deadly plague destroys them all. Uhura's secret songs may hold the key to a cure, but the clues are veiled in layers of mystery. The plague is kiling humans, threatening other planets—and Kirk must crack the code before the Enterprise succumbs
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Classic Trek, Classic book - published 26 years ago and still very enjoyable. Interesting characters and good use of the original TOS cast. Too bad that the late Janet Kagan didn't get around to writing another story (especially giving us more "Evan Wilson").