Daddy's Girl by Lisa Scottoline

Law professor Natalie Greco finds her world turned upside down when colleague, Angus Holt, talks her into teaching a seminar at a local prison. When a riot breaks out, she is attacked, then rushes to the aid of a severely injured guard who wants her to give a message to his wife. Finding herself charged with murder, she flees and tries to untangle the mystery causing ruthless killers to hunt her down. Refusing to involve her family, she rushes headlong into rescue mode, determined to see justice done. A great mystery. Sandy Penton.