Inside the federal courthouse, a single gunshot punches a hole through the window, leaving two bodies in its wake. One of the victims is an Assistant United States Attorney. The other is juror number five. Due to the nature of the crime, the OIO is assigned to evaluate the security measures implemented by the U.S. Marshal Service.

Special Agent Alexis Parker has only been back on the job for three months when she's tasked to investigate the double homicide, but identifying the killer won't be easy since the evidence leads to nothing but dead ends. Relying on her instincts, despite her colleagues' protests, Alex digs deeper, determined to prove that they've been focused on the wrong target all along.

Meanwhile, Alex receives a call from attorney Jack Fletcher. He needs to hire a private investigator, and since she has a soft spot for this particular lawyer, she agrees to help. Moonlighting is frowned upon by the federal government, but Alex has never been a stickler for the rules. However, juggling her side business with her government job would be easier without Agent Lucca poking around, determined to discover the truth behind Alex's resignation and reinstatement.