An ATF agent is found in her home, an apparent victim of suicide. Don, having been involved with her, asks Charlie to run algorithms to determine if she was likely suicidal. After determining that she had much to live for, Charlie and Don take the investigation from the ATF and decide to hunt down likely killers. A local Ayrian bike gang proves a useful lead and Don finally discovers (with the help of the usual CalSci graduates) that the agent's death was really an inside job.