No time like the past - Greg Cox

Stardate 6422.5.A diplomatic mission to the planet Yusub erupts in violence when ruthless Orion raiders attempt to disrupt the crucial negotiations by force. Caught in the midst of tense and dangerous situation, Captain James T. Kirk of the U.S.S Enterprisefinds an unexpected ally in the form of an enigmatic stranger who calls herself "Annika Seven."

Stardate 53786.1.Seven of Nine is taking part in an archaeological expedition on an obscure planetoid in the Delta Quadrant when a disastrous turn of events puts Voyager's away team in jeopardy-and transports Seven across time and space to Yusub, where she comes face to face with one of Starfleet's greatest legends.

Stardate 6422.5.Kirk knows better than most the danger that even a single castaway from the future can pose to the timeline, so he and Seven embark on a hazardous quest to return her to her own era. But there are others who crave the knowledge Seven possesses, and they will stop at nothing to obtain it-even if this means seizing control of the Enterprise!