Jessica Shepard is an on the rise police officer of San Francisco's esteemed police department, after having solved a big case about a serial killer. Her mentor John Mills is proud of Jessica as a father would be of his daughter, since Mills was the partner of Jessica's late father. With a newly established promotion, Jessica finds that she might once again have to prove herself in a department that takes no prisoners. Not to mention a new partner named Mike Delmarco, who might be Jessica's next closest thing to a confidant. However, a man has been found dead and the two officers are brought into the investigation. What they find is a surprise when the dead in question was a man Jessica slept with, he being part of a list of one night stands that Jessica has engaged in. Now under suspicion and a terrible drinking problem gnawing at her, Jessica will have to prove to her superiors...