Iris, a Bosnian immigrant, is arrested on the suspicion of killing a judge for deporting her brother. Vincent insists that Iris is innocent, so trusting his instincts, Cat works behind-the-scenes to uncover the truth. When Cat's actions disrupt the investigation, Joe places her on leave. Nevertheless, she continues on her own to discover that Iris is hiding a family secret, and needs Vincent's help. JT is concerned that Vincent risks exposure to Murifield by helping Cat, leading Cat to work out a way to communicate with Vincent without seeking him out.