Hero by Thomas Perry

Justine Poole works for the private security firm Spengler-Nash. One evening, Justine is assisting her boss Ben, making sure Jerry and Estelle Pinsky get home safely. Justine and Ben succeed in protecting the Pinskys, but Justine kills two of the five men who were attempting to rob the couple at their home. Mr. Conger, who hired the robbers, is embarrassed that a woman was able to basically take out five men. He hires hit man Leo Sealy to kill Justine. Hero follows the cat and mouse game between Justine and Sealy around Los Angeles. Will Justine be able to stay alive and eliminate the threat?