Saving daylight : The sentinel wars

"After being locked away in isolation for two hundred years, Serena Brinn returns home to find nothing left of her old life. Many of her loved ones are dead. Life has moved on without her. Even her betrothed is now bound irrevocably to another woman. In an effort to create a new life for herself, she leaves the safety of her home and sets out alone. But the world has changed. Customs are different. Technology has advanced beyond her comprehension...