When Michael treats a teenage boy for bruises at the clinic, he becomes suspicious about an abusive parent in the home. His suspicions are confirmed when his father, Ben, comes to pick him up and attacks the vending machine in a blind rage. Michael quickly realizes that the rage isn't natural and takes Ben to Holt Neuro for an MRI. Tests reveal that a malignant brain tumor is causing the outbursts, and Ben will die if he doesn't get immediate treatment. But Ben refuses treatment and says he'd rather die. When Michael presses his patient for information, Ben reveals the truth – he is guilt stricken after killing a woman in a hit-and-run accident several months ago. Michael is left to wonder if he's just agreed to treat the man who killed Anna. At Holt Neuro, a female firefighter is suffering from nausea and a growing tendency to drift off instead of finishing her sentences. While E-Mo gives her a psych evaluation for PTSD, Michael searches for neurological problems that may be making her ill.