The Witness/Nora Roberts/488 pgs.

At the age of 16, Elizabeth Fitch is a witness to murder--it happens to involve the Russian mob.  In the course of being "hidden" so that she can testify against the mob, her protectors are murdered, and Elizabeth manages to escape. Twelve years later, Elizabeth has become "Abigail Lowery" a computer security specialist, and somewhat a recluse in Arkansas. Then she draws the attention of local police chief, Brooks Gleason. After that, it is pure Nora Roberts: suspense, romance, etc. It's a fast read, and pretty entertaining.