Dwellers in the Crucible

Essef - Warrantors of Peace: the Federation's daring experiment to prevent war among its members. each Warrantor, man or woman is hostage for the government of his native world - and is instantly killed if that world breaks the peace. Now Romulans have kidnapped six Warrantors, to foment political chaos - and then civil war - within the Federation. Captain Kirk must send Sulu to infiltrate Romulan territory, find the hostages, and bring them back alive - before the Federation self-destructs!