Star Trek: Defiant Annual

After the classified information she stole from the Klingon High Council fails to earn back her favor with Romulan intelligence, Commander Sela is forced to take drastic action and turns back the clock-literally. But what was supposed to be a surefire plan to correct her failed coup over the Klingons quickly spirals into chaos when the technology malfunctions and sends her to a devastated war-torn past with the last person Sela ever wanted to see again-her mother, Tasha Yar.