Rihannsu, Book 1.
Ael t'Rllaillieu is a noble – and dangerous – Romulan commander. But when the Romulans kidnap Vulcans, intending to harness their mind power through genetic experimentation, Ael decides on treason. Captain Kirk, her old enemy, joins her in a secret pact to destroy the research labaratory and free the captive Vulcans. When the Romulans discover their plan, the Neutral Zone seethes with schemes and counter-schemes, sabotage, and war!