The Passenger by Lisa Lutz

When Tanya Dubois' husband, Frank, accidentally dies after falling down the stairs, she decides to leave town. In fact, Tanya is not her real name and, fearing that she will be found out after being on the run for over ten years, she feels has no choice but to flee. Throughout The Passenger, the reader follows "Tanya" around the country as she takes on new identities and as her past is slowly revealed. Not being able to settle down anywhere is stressful and dangerous for "Tanya" and the people who cross her path. The Passenger is a page-turner that is reminiscent of the Jane Whitefield novels by Thomas Perry and "Tanya" could be the criminal sister of Sue Grafton's Kinsey Millhone.