The Gathering Edge by Sharon Lee and Steve Miller

“The landmark 20th Liaden Universe novel finds Theo Waitley, bonded to the sentient starship Bechimo, seeking an escape from the hordes of people who wish to kill her, seize her vessel, and arrest more or less her entire crew. The Bechimo suggests a vacation of sorts in “safe space.” But that safety falls into immediate question when the walls between universes and times grow thin, and things start leaking through­including entire starships. One, a battle-scarred relic from an ancient, doomed war, is crewed by Theo’s own ancestors­and they could use some help in the survival department. The anomalous scenario gives Theo serious choices to make, transforming the “safe space” into something much more perilous­and much more adventurous. ” — Barnes & Noble Sci-Fi and Fantasy