Captain Kirk and Doctor McCoy accompany Spock to the Vulcan Academy Hospital in search of an experimental treatment for a badly wounded Enterprise crew member. But with Spock’s mother also a patient in the hospital, Kirk soon becomes involved in the complex drama of Spock’s family.

Suddenly, patients are dying, and Kirk suspects the unthinkable—murder on Vulcan! But can he convince the Vulcans that something as illogical as murder is possible? Until the killer is caught, everyone is in danger!