Star Trek: Rihannsu Series by Diane Duane, Peter Morwood

Ael t' Rlailiiu is a noble and dangerous Romulan Commander. But when the Romulans kidnap Vulcans to genetically harness their mind power, Ael decides on treason. Captain Kirk, her old enemy, joins her in a secret pact to destroy the research laboratory and free the captive Vulcans. When the Romulans discover their plan, the Neutral Zone seethes with schemes and counter-schemes, sabotage and war.

They are a race of warriors, a noble people to whom honor is all. They are cousin to the Vulcan, ally to the Klingon, and Starfleet's most feared and cunning adversary. They are the Romulans, and for eight years, Federation Agent Terise LoBrutto has hidden in their midst. Now the presence of a captured Starfleet officer forces her to make a fateful choice between exposure and the chance to escape: maintain her cover -- or save the life of Dr... moreThey are a race of warriors, a noble people to whom honor is all. They are cousin to the Vulcan, ally to the Klingon, and Starfleet's most feared and cunning adversary. They are the Romulans, and for eight years, Federation Agent Terise LoBrutto has hidden in their midst. Now the presence of a captured Starfleet officer forces her to make a fateful choice between exposure and the chance to escape: maintain her cover -- or save the life of Dr. Leonard McCoy?Here, in a startlingly different adventure, is the truth behind one of the most fascinating alien races ever created in "Star Trek" -- the Romulans. less

The sword was the ultimate symbol of Romulan power, tradition, and pride. It lay in the Senate Chamber of the Romulan Star Empire, revered and untouched for centuries, until the day Dr. Leonard McCoy was tried for treason -- and both were stolen during a daring attack on Romulus itself. Now, to avenge that insult and save face in the eyes of their deadly enemies, the Empire must recover the sword at any cost... moreThe sword was the ultimate symbol of Romulan power, tradition, and pride. It lay in the Senate Chamber of the Romulan Star Empire, revered and untouched for centuries, until the day Dr. Leonard McCoy was tried for treason -- and both were stolen during a daring attack on Romulus itself. Now, to avenge that insult and save face in the eyes of their deadly enemies, the Empire must recover the sword at any cost. Their envoys to the Federation demand the return of the sword and the extradition of the Romulan renegades who aided the "Starship Enterprise(TM) " in McCoy's escape. If diplomacy fails, the Romulans will trap the Klingons(TM) and the Federation in open war.In such dangerous times, the "Starship Enterprise" is assigned the most valuable -- and volatile -- element of all: the fugitive Ael, her stolen Bird-of-Prey "Bloodwing," and the sword they carry. Ael will undoubtedly attempt to use ship and sword to foil her enemies and play her hand in the dangerous game that she's begun. But she will do it all under the watchful eyes of James T. Kirk, the Federation starship captain who knows her dangerously well... less

At last, the United Federation of Planets and the Romulan Star Empire have agreed to meet on neutral ground to attempt to resolve the tangle of intrigue and conspiracy that began with the hijacking of the "U.S.S. Intrepid" many years ago -- but the meeting may be as dangerous as the war they hope to avoid. As a show of good faith, the crew of the legendary "Starship Enterprise(TM) " has been ordered to attend the talks... moreAt last, the United Federation of Planets and the Romulan Star Empire have agreed to meet on neutral ground to attempt to resolve the tangle of intrigue and conspiracy that began with the hijacking of the "U.S.S. Intrepid" many years ago -- but the meeting may be as dangerous as the war they hope to avoid. As a show of good faith, the crew of the legendary "Starship Enterprise(TM) " has been ordered to attend the talks. In their informal charge is Romulan renegade Ael, the wanted fugitive who, with Kirk, served as a catalyst of the current troubles. Kirk must represent the interests of the Federation first and foremost, but the best approach to an agreement remains muddled in the ever-shifting Romulan order.And the visiting Romulan party is as fractious and divided as their troubled world. Among the Romulan nobles in attendance are the hero and popular Senator Arrhae, who secretly helped rescue Dr. Leonard McCoy from a Romulan execution, and the very men and women who put McCoy on trial for treason -- and tried to carry out the sentence.As Kirk and crew attempt to renegotiate a delicate peace, and Romulans attempt to restore their tarnished honor, it becomes increasingly apparent that their only course of action is to prepare for war! less

THE HISTORIC SAGA BEGINS Born in the twilight years of Vulcan's violent and passionate past, those who declared themselves Rihannsu chose to reign free in the unknown reaches of space rather than to serve under the new tyranny of logic. Having severed themselves from their homeworld, they survived the perilous voyage across the stars to wash ashore on a distant planet, there to begin the civilization that would one day flower into the Romulan Star Empire... moreTHE HISTORIC SAGA BEGINS Born in the twilight years of Vulcan's violent and passionate past, those who declared themselves Rihannsu chose to reign free in the unknown reaches of space rather than to serve under the new tyranny of logic. Having severed themselves from their homeworld, they survived the perilous voyage across the stars to wash ashore on a distant planet, there to begin the civilization that would one day flower into the Romulan Star Empire. Now, after millennia of wars and conquests, that empire is decaying from within, surrendering its noble heritage to reckless ambition, abandoning honor for kidnapping and murder. The corruption is so great that the Rihannsu's finest military officer -- Commander Ael t'Rllaillieu of the warbird Bloodwing -- believes she can save her people only by joining forces with her greatest enemy: Captain James T. Kirk of the Starship Enterprise™. Meanwhile, on the Romulan homeworld, a Federation deep-cover agent has been posing as a household servant named Arrhae i-Khellian -- but her operation takes a strange turn when a captured Starfleet officer is brought to her home . . . The lives of Ael, Arrhae, and the crew of the Enterprise come together in these astonishing adventures -- originally published in four volumes: My Enemy, My Ally; The Romulan Way; Swordhunt; and Honor Blade -- that will challenge everything you thought you knew about the Romulans. less